**Mercedes Engine Code: Your Guide to Understanding Issues**

Mercedes Engine Codes are crucial for diagnosing and resolving issues in your vehicle. At AutoExplain.com, we provide expert remote diagnostics, programming, and software installation services, assisting vehicle owners, repair shops, and automotive technicians in understanding and effectively fixing these problems. With our support, you can quickly identify and resolve issues, ensuring optimal vehicle performance.

1. What is a Mercedes Engine Code?

A Mercedes engine code, also known as a Diagnostic Trouble Code (DTC), is a standardized alphanumeric code that identifies a specific problem detected by the vehicle’s onboard computer system. These codes are essential for diagnosing malfunctions in various systems, from the engine and transmission to emissions and electrical components. When a sensor detects a reading outside of normal parameters, it triggers a fault code, which is then stored in the vehicle’s computer. Reading these codes with a diagnostic scanner provides technicians with a starting point for troubleshooting and repair. Understanding these codes helps streamline the diagnostic process, saving time and ensuring accurate repairs.

2. Why are Mercedes Engine Codes Important?

Mercedes engine codes are vital for several reasons:

• Accurate Diagnosis: They provide specific information about the problem, helping technicians pinpoint the source of the issue.
• Reduced Downtime: By quickly identifying the problem, repair time is significantly reduced.
• Cost Savings: Accurate diagnosis prevents unnecessary repairs and part replacements.
• Preventive Maintenance: Identifying minor issues early can prevent them from escalating into major problems.
• Improved Performance: Addressing engine codes ensures optimal vehicle performance and fuel efficiency.

3. Common Types of Mercedes Engine Codes

Mercedes engine codes are categorized into several types based on the system they relate to. Here’s a breakdown of the common categories:

• P Codes (Powertrain): These codes relate to the engine, transmission, and related components. They are the most common type of engine codes.
• B Codes (Body): These codes pertain to body-related systems such as airbags, central locking, and electric windows.
• C Codes (Chassis): These codes relate to chassis systems like ABS, traction control, and suspension.
• U Codes (Network/Communication): These codes indicate issues with the vehicle’s communication network, often involving multiple control modules.

Each category is further divided into subcategories and specific codes that provide detailed information about the fault. Understanding these categories helps technicians narrow down the problem area and focus their diagnostic efforts effectively.

4. Understanding the Structure of a Mercedes Engine Code

Each Mercedes engine code follows a specific format that provides information about the fault’s nature and location. The code typically consists of five characters:

1. First Character: Indicates the system category (P, B, C, or U).
2. Second Character: Specifies whether the code is generic (0) or manufacturer-specific (1).
3. Third Character: Identifies the subsystem involved, such as fuel system, ignition system, or emissions system.
4. Fourth and Fifth Characters: Provide the specific fault code within that subsystem.

For example, a code like P0300 indicates a generic powertrain code (P0) related to a random/multiple cylinder misfire (300). Decoding the structure helps technicians quickly understand the code’s meaning and proceed with the appropriate diagnostic steps.

5. Common Mercedes Engine Codes and Their Meanings

Here’s a list of some common Mercedes engine codes and their meanings:

Code	Meaning	Possible Causes
P0171	System Too Lean (Bank 1)	Vacuum leak, faulty MAF sensor, fuel pump issue, clogged fuel filter
P0174	System Too Lean (Bank 2)	Vacuum leak, faulty MAF sensor, fuel pump issue, clogged fuel filter
P0300	Random/Multiple Cylinder Misfire Detected	Faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression
P0400	Exhaust Gas Recirculation Flow Malfunction	Faulty EGR valve, clogged EGR passages, vacuum leaks
P0420	Catalyst System Efficiency Below Threshold (Bank 1)	Faulty catalytic converter, exhaust leaks, O2 sensor issues
P0455	Evaporative Emission Control System Leak Detected (Large)	Loose fuel cap, faulty purge valve, cracked EVAP hoses
P0505	Idle Air Control System Malfunction	Faulty IAC valve, vacuum leaks, throttle body issues
P0700	Transmission Control System Malfunction	Faulty transmission sensors, solenoid issues, low transmission fluid
P2000	NOx Trap Efficiency Below Threshold (Bank 1)	Faulty NOx sensor, exhaust leaks, issues with the NOx trap system
P261F71	Circulation Pump Output Malfunction; Actuator Blocked	Coolant intrusion into vacuum system, faulty water pump, issues with the vacuum system
P126A00	OM642 Engine Oil Cooler Leak	Failure of intake manifolds or intake manifold actuator motor, EGR soot buildup causing intake swirl flaps to stick

This table provides a starting point for diagnosing common issues in Mercedes vehicles. For more specific and detailed information, consider using a professional diagnostic tool or consulting with a Mercedes specialist.

6. Step-by-Step Guide to Diagnosing a Mercedes Engine Code

Diagnosing a Mercedes engine code involves a systematic approach to identify the root cause of the problem. Here’s a step-by-step guide:

1. Read the Code: Use an OBD-II scanner to retrieve the stored engine codes from the vehicle’s computer.
2. Record the Code: Write down the exact code and any freeze frame data (information about the vehicle’s condition when the code was set).
3. Research the Code: Consult a reliable source (like AutoExplain.com) to understand the meaning of the code and potential causes.
4. Inspect the Obvious: Check for any visible issues such as loose gas cap, disconnected hoses, or damaged wiring.
5. Gather Information: Collect information about the vehicle’s recent performance, any unusual symptoms, and recent repairs.
6. Perform Basic Tests: Conduct basic tests based on the code’s potential causes, such as checking vacuum lines for leaks or testing sensor outputs with a multimeter.
7. Consult Technical Resources: Refer to Mercedes-specific diagnostic procedures, wiring diagrams, and technical service bulletins (TSBs) for detailed guidance.
8. Isolate the Problem: Use diagnostic tools and techniques to narrow down the source of the fault. This may involve testing individual components or systems.
9. Verify the Repair: After making a repair, clear the code and perform a test drive to ensure the problem is resolved and the code does not return.

7. Tools Needed for Diagnosing Mercedes Engine Codes

Having the right tools is essential for accurately diagnosing Mercedes engine codes. Here’s a list of commonly used tools:

• OBD-II Scanner: A diagnostic tool that reads and clears engine codes.
• Multimeter: Used to measure voltage, current, and resistance for testing electrical components.
• Vacuum Gauge: Measures vacuum levels to identify leaks in the intake system.
• Fuel Pressure Tester: Measures fuel pressure to diagnose fuel system issues.
• Compression Tester: Checks cylinder compression to identify engine mechanical problems.
• Smoke Machine: Used to detect vacuum and EVAP system leaks.
• Wiring Diagrams: Essential for tracing electrical circuits and troubleshooting wiring issues.
• Mercedes-Specific Diagnostic Software: Advanced software like Mercedes XENTRY or Autologic provides in-depth diagnostics and programming capabilities.

Using these tools effectively, combined with a thorough understanding of Mercedes systems, enables technicians to diagnose and repair engine code issues accurately.

8. How to Clear a Mercedes Engine Code

Clearing a Mercedes engine code is a straightforward process, but it’s important to understand when and why you should do it. Here’s how to clear a code:

1. Connect the OBD-II Scanner: Plug the scanner into the vehicle’s OBD-II port, typically located under the dashboard.
2. Turn on the Ignition: Turn the ignition key to the “ON” position without starting the engine.
3. Navigate to the Code Clearing Function: Follow the scanner’s instructions to access the “Clear Codes” or “Erase Codes” function.
4. Confirm the Clearing: The scanner will typically ask for confirmation before clearing the codes. Confirm the action.
5. Verify the Clearing: After clearing the codes, start the engine and check if the check engine light remains off.

It’s important to note that clearing a code does not fix the underlying problem. The code will likely return if the issue is not resolved. Clear codes only after you have diagnosed and repaired the fault.

9. When to Seek Professional Help

While some engine codes can be resolved with simple troubleshooting, others require professional expertise. Here are situations when you should seek help from a qualified Mercedes technician:

• Complex Codes: Codes related to the transmission, ABS, or other complex systems often require specialized knowledge and tools.
• Recurring Codes: If a code returns shortly after being cleared, it indicates an underlying issue that needs professional attention.
• Multiple Codes: When multiple codes appear simultaneously, it can indicate a more complex problem that requires comprehensive diagnosis.
• Unfamiliar Symptoms: If you experience unusual symptoms such as rough idling, stalling, or loss of power, it’s best to consult a professional.
• No Diagnostic Equipment: If you lack the necessary diagnostic tools or experience, seeking professional help can save time and prevent further damage.

AutoExplain.com offers remote diagnostic and programming services to assist you with these complex issues. Our experienced technicians can provide expert guidance and support to resolve your Mercedes engine code problems efficiently.

10. The Role of Sensors in Mercedes Engine Codes

Sensors play a critical role in the operation of Mercedes vehicles. They monitor various parameters and provide data to the engine control unit (ECU), which uses this information to optimize performance and detect faults. Common sensors include:

• Mass Air Flow (MAF) Sensor: Measures the amount of air entering the engine.
• Oxygen (O2) Sensors: Monitor the oxygen content in the exhaust gas.
• Crankshaft Position Sensor: Detects the position and speed of the crankshaft.
• Camshaft Position Sensor: Detects the position of the camshaft.
• Throttle Position Sensor (TPS): Monitors the position of the throttle plate.
• Coolant Temperature Sensor (CTS): Measures the temperature of the engine coolant.

When a sensor fails or provides inaccurate readings, it can trigger an engine code. Diagnosing sensor-related codes involves testing the sensor’s output voltage or resistance and comparing it to specifications. Replacement of faulty sensors is often necessary to resolve these issues.

11. Common Mistakes to Avoid When Diagnosing Mercedes Engine Codes

Diagnosing Mercedes engine codes can be challenging, and it’s easy to make mistakes that can lead to misdiagnosis and unnecessary repairs. Here are some common mistakes to avoid:

• Ignoring Symptoms: Relying solely on the code without considering the vehicle’s symptoms can lead to incorrect conclusions.
• Not Verifying the Code: Failing to research the code’s meaning and potential causes can result in misguided diagnostic efforts.
• Replacing Parts Without Testing: Replacing parts based on guesswork rather than proper testing can be costly and ineffective.
• Neglecting Basic Checks: Overlooking simple issues like loose connections, vacuum leaks, or low fluid levels can lead to misdiagnosis.
• Using Incompatible Parts: Installing aftermarket parts that are not designed for Mercedes vehicles can cause further problems.
• Not Clearing Codes After Repair: Forgetting to clear the codes after completing a repair can lead to confusion and continued check engine light illumination.

By avoiding these common mistakes and following a systematic diagnostic approach, you can increase the accuracy and efficiency of your repairs.

12. How to Prevent Mercedes Engine Codes

Preventing Mercedes engine codes involves regular maintenance and proactive care. Here are some tips to help keep your Mercedes running smoothly:

• Follow the Maintenance Schedule: Adhere to the manufacturer’s recommended maintenance schedule for oil changes, filter replacements, and other services.
• Use Quality Parts and Fluids: Use OEM or high-quality aftermarket parts and fluids that meet Mercedes specifications.
• Address Issues Promptly: Don’t ignore warning lights or unusual symptoms. Address problems as soon as they arise to prevent them from escalating.
• Regular Inspections: Conduct regular inspections of hoses, belts, and other components to identify potential issues before they cause problems.
• Proper Driving Habits: Avoid harsh acceleration, excessive idling, and other driving habits that can put stress on the engine and other systems.
• Keep the Vehicle Clean: Regularly clean the engine compartment and undercarriage to prevent corrosion and damage to electrical components.

By following these preventive measures, you can reduce the likelihood of encountering engine codes and keep your Mercedes in top condition.

13. The Impact of Fuel Quality on Mercedes Engine Codes

Fuel quality can significantly impact the performance and reliability of Mercedes engines. Using low-quality or contaminated fuel can lead to various problems, including:

• Misfires: Poor fuel combustion can cause engine misfires, triggering codes like P0300.
• Fuel System Issues: Contaminants in the fuel can clog fuel filters, damage fuel pumps, and cause injector malfunctions.
• Catalytic Converter Damage: Burning poor-quality fuel can damage the catalytic converter, leading to codes like P0420.
• Sensor Failures: Deposits from low-quality fuel can foul O2 sensors and other components, causing them to fail prematurely.

To avoid these issues, use high-quality fuel from reputable stations and consider using fuel additives to help clean and protect your fuel system.

14. How to Use a Mercedes Engine Code to Improve Fuel Efficiency

Addressing engine codes promptly can improve your Mercedes’ fuel efficiency. Here’s how:

• Fix Misfires: Misfires waste fuel and reduce engine power. Addressing misfire codes (e.g., P0300) by replacing faulty spark plugs or ignition coils can restore fuel efficiency.
• Address Lean/Rich Conditions: Codes indicating a lean (P0171, P0174) or rich condition can result in poor fuel economy. Fixing vacuum leaks, replacing faulty sensors, or addressing fuel system issues can improve efficiency.
• Maintain the Emissions System: Codes related to the EGR system (P0400) or catalytic converter (P0420) can impact fuel efficiency. Ensuring these systems are functioning properly is essential.
• Optimize Idle Control: Codes related to the idle air control system (P0505) can cause excessive idling and fuel consumption. Repairing or replacing the IAC valve can improve fuel efficiency.

By addressing these issues, you can optimize your Mercedes’ engine performance and maximize fuel efficiency.

15. The Future of Mercedes Engine Code Diagnostics

The future of Mercedes engine code diagnostics is evolving with advancements in technology. Here are some trends to watch for:

• Artificial Intelligence (AI): AI-powered diagnostic tools can analyze vast amounts of data to identify complex issues and provide more accurate diagnoses.
• Remote Diagnostics: Remote diagnostic services like those offered by AutoExplain.com will become more prevalent, allowing technicians to diagnose and repair vehicles from anywhere in the world.
• Predictive Maintenance: Predictive maintenance systems use sensor data and machine learning to anticipate potential problems before they occur, reducing downtime and repair costs.
• Enhanced Connectivity: Increased vehicle connectivity will enable real-time monitoring of vehicle systems and over-the-air software updates to address issues remotely.
• Augmented Reality (AR): AR technology can provide technicians with visual guidance and information overlays to assist with diagnostics and repairs.

These advancements will make Mercedes engine code diagnostics more efficient, accurate, and accessible, improving the overall ownership experience.

16. AutoExplain.com: Your Partner in Mercedes Engine Code Solutions

At AutoExplain.com, we understand the complexities of Mercedes engine code diagnostics and offer a range of services to help you resolve these issues quickly and effectively. Our services include:

• Remote Diagnostics: Our experienced technicians can remotely diagnose your Mercedes engine codes using advanced diagnostic tools and techniques.
• Programming and Software Installation: We provide programming and software installation services to address issues related to the ECU, TCM, and other control modules.
• Navigation Updates: We offer navigation update services to ensure your Mercedes has the latest maps and features.
• Key Programming: Our key programming services can help you replace lost or damaged keys and program new keys for your vehicle.
• Technical Support: We provide expert technical support via WhatsApp and email to assist you with any questions or issues you may encounter.

With AutoExplain.com, you can trust that you’re getting the highest level of expertise and support for your Mercedes engine code needs.

17. Mercedes Fault Code: P261F71 Explained

The Mercedes fault code P261F71 indicates a malfunction in the output for the circulation pump, specifically that the actuator is blocked. This issue is commonly found in Mercedes Sprinter vans and is often due to coolant intrusion into the vacuum system via the water pump.

Known Problem Of: Mercedes Sprinter Vans

Likely Causes: Coolant intrusion into the vacuum system via the water pump.

What’s Happening?: On the OM651 4-cylinder diesel engine, the coolant water pump is vacuum-actuated. The internal seal in the water pump can fail, allowing coolant (antifreeze) to enter the vacuum system. As the vehicle is driven, the vacuum system pulls coolant deeper into the system, causing damage.

Possible Symptoms You May Experience:

• Check Engine Light
• Little to no acceleration
• Coolant leak
• Brake Pedal Pressure Issues
• Engine overheating

Parts That Could Need Replacement:

• Water Pump
• Coolant
• Seals
• Tubes
• Hoses
• Vacuum Actuators
• Vacuum Pump

System(s) Affected:

• Engine
• Cooling System
• Vacuum System
• Turbocharging
• Brake System

Severity: This issue can be very severe if left unfixed and requires a master-level technician.

18. Mercedes Fault Code: P126A00 – OM642 Engine Oil Cooler Leak Explained

The Mercedes fault code P126A00 indicates an issue with the intake port shutoff actuator. This problem is frequently observed in Mercedes Sprinter vans and is often caused by a failure of the intake manifolds or the intake manifold actuator motor.

Known Problem Of: Mercedes Sprinter Vans

Likely Causes: Failure of component: intake manifolds, or the intake manifold actuator motor.

What’s Happening?: Over time, the inside of the intake manifolds gets clogged with EGR soot, causing the intake swirl flaps to stick. This binding affects the motor, triggering the check engine light and a significant loss of acceleration.

Possible Symptoms You May Experience: Loss of acceleration, check engine light.

Parts That Could Need Replacement: Intake manifolds, intake manifold actuator motor.

System(s) Affected: Engine

Severity: This issue can be very severe if left unfixed and requires a master-level technician.

19. Additional Mercedes-Benz Diagnostic Trouble Codes (DTCs)

Here’s an expanded table of Mercedes-Benz Diagnostic Trouble Codes (DTCs) to help you better understand potential issues with your vehicle.

Code	System	Description	Possible Causes
P000A	Engine	Camshaft Position Actuator A Circuit (Bank 1)	Faulty camshaft position sensor, wiring issues, low oil pressure
P000B	Engine	Camshaft Position B Actuator Circuit (Bank 1)	Faulty camshaft position sensor, wiring issues, low oil pressure
P0010	Engine	‘A’ Camshaft Position Actuator Circuit (Bank 1)	Faulty camshaft actuator, wiring issues, low oil pressure
P0011	Engine	‘A’ Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)	Faulty camshaft actuator, timing chain wear, low oil pressure
P0012	Engine	‘A’ Camshaft Position – Timing Over-Retarded (Bank 1)	Faulty camshaft actuator, timing chain wear, low oil pressure
P0016	Engine	Crankshaft Position – Camshaft Position Correlation (Bank 1, Sensor A)	Misalignment of timing components, faulty sensors, wiring issues
P0017	Engine	Crankshaft Position – Camshaft Position Correlation (Bank 1, Sensor B)	Misalignment of timing components, faulty sensors, wiring issues
P0020	Engine	‘B’ Camshaft Position Actuator Circuit (Bank 2)	Faulty camshaft actuator, wiring issues, low oil pressure
P0021	Engine	‘B’ Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)	Faulty camshaft actuator, timing chain wear, low oil pressure
P0022	Engine	‘B’ Camshaft Position – Timing Over-Retarded (Bank 2)	Faulty camshaft actuator, timing chain wear, low oil pressure
P0030	Emissions	HO2S Heater Control Circuit (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, blown fuse
P0031	Emissions	HO2S Heater Control Circuit Low (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues
P0032	Emissions	HO2S Heater Control Circuit High (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues
P0036	Emissions	HO2S Heater Control Circuit (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues, blown fuse
P0037	Emissions	HO2S Heater Control Circuit Low (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues
P0038	Emissions	HO2S Heater Control Circuit High (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues
P0045	Turbocharger	Turbocharger Boost Control Solenoid Circuit/Open	Faulty solenoid, wiring issues, vacuum leaks
P0046	Turbocharger	Turbocharger Boost Control Solenoid Circuit Range/Performance	Faulty solenoid, wiring issues, vacuum leaks
P0068	Engine	MAP/MAF – Throttle Position Correlation	Vacuum leaks, faulty sensors, throttle body issues
P0070	Engine	Ambient Air Temperature Sensor Circuit	Faulty sensor, wiring issues
P0087	Fuel System	Fuel Rail/System Pressure – Too Low	Faulty fuel pump, clogged fuel filter, fuel leaks
P0088	Fuel System	Fuel Rail/System Pressure – Too High	Faulty fuel pressure regulator, fuel pump issues
P0100	Engine	Mass or Volume Air Flow Circuit	Faulty MAF sensor, wiring issues
P0101	Engine	Mass or Volume Air Flow Circuit Range/Performance	Dirty MAF sensor, vacuum leaks, air intake restrictions
P0102	Engine	Mass or Volume Air Flow Circuit Low Input	Faulty MAF sensor, wiring issues
P0103	Engine	Mass or Volume Air Flow Circuit High Input	Faulty MAF sensor, wiring issues
P0106	Engine	Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance	Faulty MAP sensor, vacuum leaks, wiring issues
P0107	Engine	Manifold Absolute Pressure/Barometric Pressure Circuit Low Input	Faulty MAP sensor, vacuum leaks, wiring issues
P0108	Engine	Manifold Absolute Pressure/Barometric Pressure Circuit High Input	Faulty MAP sensor, wiring issues
P0110	Engine	Intake Air Temperature Circuit	Faulty IAT sensor, wiring issues
P0111	Engine	Intake Air Temperature Circuit Range/Performance	Faulty IAT sensor, wiring issues
P0112	Engine	Intake Air Temperature Circuit Low Input	Faulty IAT sensor, wiring issues
P0113	Engine	Intake Air Temperature Circuit High Input	Faulty IAT sensor, wiring issues
P0116	Engine	Engine Coolant Temperature Circuit Range/Performance	Faulty coolant temperature sensor, thermostat issues, cooling system problems
P0117	Engine	Engine Coolant Temperature Circuit Low Input	Faulty coolant temperature sensor, wiring issues
P0118	Engine	Engine Coolant Temperature Circuit High Input	Faulty coolant temperature sensor, wiring issues
P0120	Engine	Throttle/Pedal Position Sensor/Switch A Circuit	Faulty throttle position sensor, wiring issues
P0121	Engine	Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance	Faulty throttle position sensor, wiring issues
P0122	Engine	Throttle/Pedal Position Sensor/Switch A Circuit Low Input	Faulty throttle position sensor, wiring issues
P0123	Engine	Throttle/Pedal Position Sensor/Switch A Circuit High Input	Faulty throttle position sensor, wiring issues
P0125	Engine	Insufficient Coolant Temperature For Closed Loop Fuel Control	Faulty coolant temperature sensor, thermostat issues
P0128	Engine	Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)	Faulty thermostat, cooling system issues
P0130	Emissions	O2 Sensor Circuit (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0131	Emissions	O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0132	Emissions	O2 Sensor Circuit High Voltage (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues
P0133	Emissions	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)	Faulty O2 sensor, exhaust leaks, wiring issues
P0134	Emissions	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0135	Emissions	O2 Sensor Heater Circuit (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues
P0136	Emissions	O2 Sensor Circuit (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0137	Emissions	O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0138	Emissions	O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues
P0139	Emissions	O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)	Faulty O2 sensor, exhaust leaks, wiring issues
P0140	Emissions	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0141	Emissions	O2 Sensor Heater Circuit (Bank 1, Sensor 2)	Faulty O2 sensor, wiring issues
P0150	Emissions	O2 Sensor Circuit (Bank 2, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0151	Emissions	O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0152	Emissions	O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)	Faulty O2 sensor, wiring issues
P0153	Emissions	O2 Sensor Circuit Slow Response (Bank 2, Sensor 1)	Faulty O2 sensor, exhaust leaks, wiring issues
P0154	Emissions	O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0155	Emissions	O2 Sensor Heater Circuit (Bank 2, Sensor 1)	Faulty O2 sensor, wiring issues
P0156	Emissions	O2 Sensor Circuit (Bank 2, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0157	Emissions	O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0158	Emissions	O2 Sensor Circuit High Voltage (Bank 2, Sensor 2)	Faulty O2 sensor, wiring issues
P0159	Emissions	O2 Sensor Circuit Slow Response (Bank 2, Sensor 2)	Faulty O2 sensor, exhaust leaks, wiring issues
P0160	Emissions	O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2)	Faulty O2 sensor, wiring issues, exhaust leaks
P0161	Emissions	O2 Sensor Heater Circuit (Bank 2, Sensor 2)	Faulty O2 sensor, wiring issues
P0170	Fuel System	Fuel Trim, Bank 1	Vacuum leaks, faulty O2 sensor, MAF sensor issues, fuel pressure problems
P0171	Fuel System	System Too Lean, Bank 1	Vacuum leaks, faulty O2 sensor, MAF sensor issues, fuel pressure problems
P0172	Fuel System	System Too Rich, Bank 1	Faulty O2 sensor, fuel pressure regulator issues, injector problems, MAF sensor issues
P0173	Fuel System	Fuel Trim, Bank 2	Vacuum leaks, faulty O2 sensor, MAF sensor issues, fuel pressure problems
P0174	Fuel System	System Too Lean, Bank 2	Vacuum leaks, faulty O2 sensor, MAF sensor issues, fuel pressure problems
P0175	Fuel System	System Too Rich, Bank 2	Faulty O2 sensor, fuel pressure regulator issues, injector problems, MAF sensor issues
P0180	Fuel System	Fuel Temperature Sensor A Circuit	Faulty fuel temperature sensor, wiring issues
P0181	Fuel System	Fuel Temperature Sensor A Circuit Range/Performance	Faulty fuel temperature sensor, wiring issues
P0182	Fuel System	Fuel Temperature Sensor A Circuit Low Input	Faulty fuel temperature sensor, wiring issues
P0183	Fuel System	Fuel Temperature Sensor A Circuit High Input	Faulty fuel temperature sensor, wiring issues
P0190	Fuel System	Fuel Rail Pressure Sensor Circuit	Faulty fuel pressure sensor, wiring issues
P0191	Fuel System	Fuel Rail Pressure Sensor Circuit Range/Performance	Faulty fuel pressure sensor, wiring issues
P0192	Fuel System	Fuel Rail Pressure Sensor Circuit Low Input	Faulty fuel pressure sensor, wiring issues
P0193	Fuel System	Fuel Rail Pressure Sensor Circuit High Input	Faulty fuel pressure sensor, wiring issues
P0200	Fuel System	Injector Circuit	Faulty injectors, wiring issues
P0201	Fuel System	Injector Circuit – Cylinder 1	Faulty injector, wiring issues
P0202	Fuel System	Injector Circuit – Cylinder 2	Faulty injector, wiring issues
P0203	Fuel System	Injector Circuit – Cylinder 3	Faulty injector, wiring issues
P0204	Fuel System	Injector Circuit – Cylinder 4	Faulty injector, wiring issues
P0205	Fuel System	Injector Circuit – Cylinder 5	Faulty injector, wiring issues
P0206	Fuel System	Injector Circuit – Cylinder 6	Faulty injector, wiring issues
P0207	Fuel System	Injector Circuit – Cylinder 7	Faulty injector, wiring issues
P0208	Fuel System	Injector Circuit – Cylinder 8	Faulty injector, wiring issues
P0217	Engine	Engine Overtemperature Condition	Cooling system problems, faulty thermostat
P0219	Engine	Engine Overspeed Condition	Mechanical issues, faulty sensors
P0220