P1955 Mercedes Sprinter Fault Code: Diagnosis And Solutions

The P1955 Mercedes Sprinter Fault Code indicates a problem within the intake air system or the diesel particulate filter (DPF) regeneration process; AutoExplain.com offers expert remote support to diagnose and resolve this and other complex automotive issues efficiently. Proper diagnosis of diagnostic trouble codes, along with sensor data analysis and troubleshooting procedures, can rectify the situation. Contact us for unparalleled automotive technical assistance, including help with your ECM, valve timing, and other issues.

1. Understanding the P1955 Mercedes Sprinter Fault Code

The P1955 fault code in a Mercedes Sprinter typically points to issues within the intake air system or specifically with the diesel particulate filter (DPF) regeneration. The powertrain control module (PCM) monitors various sensors to ensure optimal engine performance and emissions control. When the PCM detects that the DPF is not regenerating correctly, or that the intake air system is compromised, it can trigger the P1955 code, resulting in a malfunction indicator lamp (MIL) illumination. This code can lead to reduced engine power and potential damage to the exhaust system if not addressed promptly. AutoExplain.com can help.

2. Common Causes of the P1955 Fault Code

Several factors can lead to the P1955 fault code in Mercedes Sprinter vehicles. Identifying these common causes is crucial for accurate diagnostics and effective repairs.

2.1. Issues Related to the Diesel Particulate Filter (DPF)

2.1.1. Clogged DPF

A clogged DPF is one of the most frequent causes of the P1955 code. Over time, soot and ash accumulate in the DPF, restricting exhaust flow and increasing back pressure.

• Causes: Short trips, frequent idling, or issues with the fuel injectors can accelerate DPF clogging.
• Symptoms: Reduced engine power, increased fuel consumption, and the P1955 code.
• Solutions: Forced DPF regeneration, cleaning the DPF, or replacing the DPF if necessary.

2.1.2. Faulty DPF Sensors

The DPF system relies on sensors to monitor pressure and temperature, ensuring proper regeneration. Faulty sensors can lead to incorrect readings and trigger the P1955 code.

• Causes: Sensor failure due to heat, vibration, or contamination.
• Symptoms: Inaccurate sensor readings, failed regeneration cycles, and the P1955 code.
• Solutions: Testing and replacing faulty DPF sensors.

2.1.3. Issues with DPF Regeneration

The DPF regeneration process burns off accumulated soot at high temperatures. Problems with this process can trigger the P1955 code.

• Causes: Faulty temperature sensors, issues with the exhaust gas recirculation (EGR) system, or problems with the fuel injection system.
• Symptoms: Incomplete regeneration cycles, increased soot accumulation, and the P1955 code.
• Solutions: Diagnosing and repairing issues with the temperature sensors, EGR system, or fuel injection system.

2.2. Intake Air System Problems

2.2.1. Leaks in the Intake Air System

Leaks in the intake air system can disrupt the air-fuel mixture, leading to inefficient combustion and the P1955 code.

• Causes: Loose or damaged hoses, cracked intercooler, or faulty intake manifold gaskets.
• Symptoms: Reduced engine power, poor fuel economy, and the P1955 code.
• Solutions: Inspecting and repairing or replacing damaged intake air components.

2.2.2. Faulty Mass Air Flow (MAF) Sensor

The MAF sensor measures the amount of air entering the engine, providing critical data to the PCM for fuel mixture adjustments. A faulty MAF sensor can trigger the P1955 code.

• Causes: Contamination, damage, or electrical faults within the MAF sensor.
• Symptoms: Erratic engine performance, poor fuel economy, and the P1955 code.
• Solutions: Cleaning or replacing the MAF sensor.

2.2.3. Turbocharger Issues

The turbocharger increases engine power by forcing more air into the cylinders. Problems with the turbocharger can lead to the P1955 code.

• Causes: Turbocharger failure, leaks in the turbocharger system, or issues with the turbocharger control system.
• Symptoms: Reduced engine power, excessive turbocharger noise, and the P1955 code.
• Solutions: Inspecting and repairing or replacing the turbocharger.

2.3. Other Potential Causes

2.3.1. Fuel Injector Problems

Faulty fuel injectors can disrupt the air-fuel mixture and lead to incomplete combustion, potentially triggering the P1955 code.

• Causes: Clogged or leaking fuel injectors, electrical faults, or incorrect fuel pressure.
• Symptoms: Poor engine performance, reduced fuel economy, and the P1955 code.
• Solutions: Cleaning or replacing faulty fuel injectors.

2.3.2. Exhaust Gas Recirculation (EGR) System Issues

The EGR system recirculates a portion of the exhaust gas back into the intake manifold to reduce NOx emissions. Problems with the EGR system can lead to the P1955 code.

• Causes: Clogged EGR valve, faulty EGR sensors, or leaks in the EGR system.
• Symptoms: Poor engine performance, increased emissions, and the P1955 code.
• Solutions: Cleaning or replacing the EGR valve and repairing any leaks in the system.

2.3.3. Electrical Problems

Electrical issues, such as faulty wiring or connectors, can interfere with sensor signals and trigger the P1955 code.

• Causes: Damaged wiring, corroded connectors, or short circuits.
• Symptoms: Intermittent engine problems and the P1955 code.
• Solutions: Inspecting and repairing or replacing damaged wiring and connectors.

3. Diagnosing the P1955 Mercedes Sprinter Fault Code

Effective diagnosis of the P1955 fault code requires a systematic approach and the right tools. Here’s a step-by-step guide to help you accurately identify the root cause of the problem.

3.1. Initial Inspection

Begin with a thorough visual inspection of the engine bay, focusing on the intake air system, DPF, and related components.

• Check for Obvious Issues: Look for loose or damaged hoses, cracked pipes, and any signs of leaks.
• Inspect Wiring and Connectors: Examine the wiring and connectors associated with the MAF sensor, DPF sensors, and other relevant components for damage or corrosion.

3.2. Reading and Clearing the Fault Codes

Use an OBD-II scanner to read the fault codes stored in the PCM. Record all codes present, not just the P1955 code, as additional codes can provide valuable clues.

• Clearing the Codes: After recording the codes, clear them and take the vehicle for a test drive to see if the P1955 code reappears. This step helps determine if the issue is intermittent or persistent.

3.3. Live Data Analysis

Utilize the OBD-II scanner to monitor live data from the engine sensors. Pay close attention to the following parameters:

• MAF Sensor Readings: Check the MAF sensor readings at idle and under load. Compare the readings to the manufacturer’s specifications to identify any discrepancies.
• DPF Pressure and Temperature Sensors: Monitor the pressure and temperature readings from the DPF sensors. Abnormal readings can indicate a clogged DPF or faulty sensors.
• Fuel Trims: Observe the short-term and long-term fuel trims. High fuel trim values can indicate vacuum leaks or fuel delivery issues.

3.4. Component Testing

Perform individual component tests to verify their functionality.

• MAF Sensor Testing: Use a multimeter to check the MAF sensor’s voltage and resistance. Compare the readings to the manufacturer’s specifications.
• DPF Sensor Testing: Test the DPF pressure and temperature sensors using a multimeter. Ensure the sensors are providing accurate readings.
• EGR Valve Testing: Check the EGR valve for proper operation. Use a vacuum pump to actuate the valve and ensure it moves freely.

3.5. Smoke Testing

If you suspect a leak in the intake air system, perform a smoke test. This involves introducing smoke into the intake system and looking for leaks.

• Procedure: Seal off the intake system and introduce smoke using a smoke machine. Observe the system for any escaping smoke, indicating the location of the leak.

3.6. Diagnostic Chart

Symptom	Possible Cause	Diagnostic Steps
P1955 code, reduced engine power	Clogged DPF	Check DPF pressure sensors, perform forced regeneration, inspect DPF for damage.
P1955 code, poor fuel economy	Leaks in intake air system	Perform smoke test, inspect hoses and pipes for cracks or leaks, check intercooler condition.
P1955 code, erratic engine performance	Faulty MAF sensor	Check MAF sensor readings, test sensor voltage and resistance, inspect for contamination.
P1955 code, increased emissions	EGR system issues	Inspect EGR valve for clogging, check EGR sensor readings, test EGR valve operation.
P1955 code, intermittent engine problems	Electrical problems	Inspect wiring and connectors for damage or corrosion, check sensor grounds, test circuit continuity.
P1955 code, excessive turbocharger noise	Turbocharger issues	Inspect turbocharger for damage, check turbocharger hoses and pipes for leaks, test turbocharger control system.
P1955 code, incomplete regeneration cycles	Faulty temperature sensors	Check temperature sensor readings, test sensor voltage and resistance, inspect for damage.
P1955 code, high fuel trim values	Vacuum leaks	Perform smoke test, inspect vacuum hoses and pipes for cracks or leaks, check intake manifold gasket.
P1955 code, poor engine performance	Fuel injector problems	Check fuel injector spray pattern, test fuel injector resistance, inspect for clogging.
P1955 code, increased soot accumulation	Issues with DPF regeneration	Check DPF regeneration settings, test temperature sensors, inspect EGR system.

4. Repairing the P1955 Mercedes Sprinter Fault Code

Once you have accurately diagnosed the cause of the P1955 fault code, the next step is to perform the necessary repairs. Here are detailed instructions for addressing the common issues associated with this code.

4.1. Addressing DPF Issues

4.1.1. Performing Forced DPF Regeneration

If the DPF is clogged, performing a forced regeneration can help clear the accumulated soot.

• Procedure:
  1. Connect an OBD-II scanner to the vehicle.
  2. Navigate to the DPF regeneration function in the scanner menu.
  3. Follow the on-screen instructions to initiate the regeneration process.
  4. Monitor the DPF temperature and pressure readings during the process.
  5. Ensure the regeneration completes successfully without any interruptions.

4.1.2. Cleaning or Replacing the DPF

In cases where forced regeneration is not sufficient, cleaning or replacing the DPF may be necessary.

• Cleaning Procedure:
  1. Remove the DPF from the vehicle.
  2. Use a specialized DPF cleaning solution to soak the filter.
  3. Rinse the DPF thoroughly with water.
  4. Dry the DPF completely before reinstalling it.
• Replacement Procedure:
  1. Remove the old DPF from the vehicle.
  2. Install the new DPF, ensuring all connections are secure.
  3. Reset the DPF adaptation values using an OBD-II scanner.

4.1.3. Replacing Faulty DPF Sensors

If the DPF sensors are faulty, replacing them is essential for accurate monitoring and regeneration.

• Procedure:
  1. Disconnect the electrical connector from the faulty sensor.
  2. Remove the sensor from the DPF housing.
  3. Install the new sensor, ensuring it is properly tightened.
  4. Reconnect the electrical connector.
  5. Verify the sensor readings using an OBD-II scanner.

4.2. Repairing Intake Air System Issues

4.2.1. Fixing Leaks in the Intake Air System

Repairing leaks in the intake air system is crucial for maintaining the correct air-fuel mixture.

• Procedure:
  1. Locate the leak using a smoke test.
  2. Remove the damaged hose or pipe.
  3. Replace the damaged component with a new one.
  4. Ensure all connections are properly secured.
  5. Perform another smoke test to verify the leak is fixed.

4.2.2. Replacing a Faulty MAF Sensor

Replacing a faulty MAF sensor can restore proper engine performance and fuel economy.

• Procedure:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake housing.
  3. Install the new MAF sensor, ensuring it is properly aligned.
  4. Reconnect the electrical connector.
  5. Clear the fault codes and monitor the MAF sensor readings using an OBD-II scanner.

4.2.3. Addressing Turbocharger Issues

Addressing turbocharger issues may involve repairing or replacing the turbocharger.

• Repair Procedure:
  1. Remove the turbocharger from the vehicle.
  2. Inspect the turbocharger for damage, such as cracked housings or worn bearings.
  3. Replace any damaged components.
  4. Reassemble the turbocharger and balance it.
  5. Reinstall the turbocharger on the vehicle.
• Replacement Procedure:
  1. Remove the old turbocharger from the vehicle.
  2. Install the new turbocharger, ensuring all connections are secure.
  3. Prime the turbocharger with oil before starting the engine.
  4. Monitor the turbocharger performance using an OBD-II scanner.

4.3. Addressing Other Potential Issues

4.3.1. Cleaning or Replacing Fuel Injectors

Cleaning or replacing faulty fuel injectors can improve engine performance and fuel economy.

• Cleaning Procedure:
  1. Remove the fuel injectors from the engine.
  2. Use a specialized fuel injector cleaning solution to clean the injectors.
  3. Test the fuel injectors to ensure they are spraying properly.
  4. Reinstall the fuel injectors on the engine.
• Replacement Procedure:
  1. Remove the old fuel injectors from the engine.
  2. Install the new fuel injectors, ensuring they are properly seated.
  3. Reconnect the fuel lines and electrical connectors.
  4. Prime the fuel system before starting the engine.

4.3.2. Repairing EGR System Issues

Repairing EGR system issues may involve cleaning or replacing the EGR valve and repairing any leaks in the system.

• Cleaning Procedure:
  1. Remove the EGR valve from the engine.
  2. Use a carburetor cleaner to clean the EGR valve.
  3. Ensure the EGR valve moves freely.
  4. Reinstall the EGR valve on the engine.
• Replacement Procedure:
  1. Remove the old EGR valve from the engine.
  2. Install the new EGR valve, ensuring all connections are secure.
  3. Reconnect the vacuum lines and electrical connectors.
  4. Clear the fault codes and monitor the EGR valve operation using an OBD-II scanner.

4.3.3. Repairing Electrical Problems

Repairing electrical problems involves inspecting and repairing or replacing damaged wiring and connectors.

• Procedure:
  1. Locate the damaged wiring or connector.
  2. Repair the wiring by splicing in new wires or replacing the connector.
  3. Ensure all connections are properly insulated.
  4. Test the circuit for continuity and proper voltage.

4.4. Post-Repair Verification

After performing the necessary repairs, it is essential to verify that the P1955 fault code has been resolved.

• Clear Fault Codes: Use an OBD-II scanner to clear the fault codes from the PCM.
• Test Drive: Take the vehicle for a test drive to ensure the engine is performing properly.
• Monitor Sensor Readings: Use the OBD-II scanner to monitor the sensor readings during the test drive.
• Final Scan: Perform a final scan to ensure no new fault codes have been generated.

5. Advanced Diagnostic Techniques

For complex cases, advanced diagnostic techniques may be necessary to accurately identify and resolve the P1955 fault code.

5.1. Using an Oscilloscope

An oscilloscope can be used to analyze the waveforms of sensor signals, providing valuable insights into their operation.

• MAF Sensor Analysis: Connect the oscilloscope to the MAF sensor signal wire and monitor the waveform. Look for any abnormalities, such as signal dropouts or flat lines.
• DPF Sensor Analysis: Analyze the waveforms of the DPF pressure and temperature sensors to identify any erratic behavior or signal noise.

5.2. Performing a Compression Test

A compression test can help identify issues with the engine’s cylinders, such as worn piston rings or leaking valves.

• Procedure:
  1. Remove the spark plugs from all cylinders.
  2. Insert a compression tester into each cylinder.
  3. Crank the engine and record the compression reading for each cylinder.
  4. Compare the readings to the manufacturer’s specifications.

5.3. Performing a Cylinder Leakage Test

A cylinder leakage test can help pinpoint the source of compression loss, such as leaking valves or piston rings.

• Procedure:
  1. Bring each cylinder to top dead center (TDC) on the compression stroke.
  2. Connect a cylinder leakage tester to the spark plug hole.
  3. Apply compressed air to the cylinder and listen for leaks at the exhaust pipe, intake manifold, and crankcase.

5.4. Consulting with Experts at AutoExplain.com

When facing complex diagnostic challenges, consulting with experts at AutoExplain.com can provide valuable support and guidance. Our team of experienced technicians can assist with:

• Remote Diagnostics: Utilizing remote diagnostic tools to access vehicle data and identify potential issues.
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• Wiring Diagrams: Supplying detailed wiring diagrams to assist with electrical troubleshooting.

6. Preventive Maintenance

Preventive maintenance is essential for avoiding the P1955 fault code and other engine-related problems.

6.1. Regular DPF Cleaning

Regular DPF cleaning can prevent soot and ash buildup, ensuring proper regeneration.

• Procedure: Schedule regular DPF cleaning services at recommended intervals.
• Benefits: Improved engine performance, reduced emissions, and extended DPF lifespan.

6.2. Inspecting and Replacing Air Filters

Clean air filters are crucial for maintaining proper airflow to the engine.

• Procedure: Inspect the air filter regularly and replace it when it becomes dirty or clogged.
• Benefits: Improved engine performance, better fuel economy, and reduced engine wear.

6.3. Checking and Maintaining Fuel Injectors

Regularly checking and maintaining fuel injectors can prevent clogging and ensure proper fuel delivery.

• Procedure: Use a fuel injector cleaner additive to keep the injectors clean.
• Benefits: Improved engine performance, better fuel economy, and reduced emissions.

6.4. Monitoring Engine Performance

Regularly monitoring engine performance can help identify potential issues before they escalate.

• Procedure: Pay attention to any changes in engine performance, such as reduced power, poor fuel economy, or unusual noises.
• Benefits: Early detection of potential problems, reduced repair costs, and improved vehicle reliability.

7. Tools and Equipment Needed

Having the right tools and equipment is essential for effectively diagnosing and repairing the P1955 fault code.

7.1. OBD-II Scanner

An OBD-II scanner is essential for reading and clearing fault codes, as well as monitoring live data from engine sensors.

7.2. Multimeter

A multimeter is necessary for testing sensor voltage and resistance.

7.3. Smoke Machine

A smoke machine is used for locating leaks in the intake air system.

7.4. Compression Tester

A compression tester is used for measuring the compression in each cylinder.

7.5. Cylinder Leakage Tester

A cylinder leakage tester is used for pinpointing the source of compression loss.

7.6. Specialized Tools

Specialized tools, such as DPF cleaning equipment and fuel injector cleaning kits, may be necessary for certain repairs.

8. Case Studies

8.1. Case Study 1: Clogged DPF

• Vehicle: 2016 Mercedes Sprinter
• Symptoms: P1955 code, reduced engine power
• Diagnosis: DPF pressure sensors indicated high backpressure. Forced regeneration was attempted but failed.
• Solution: The DPF was removed and cleaned. After cleaning, the DPF pressure returned to normal, and the P1955 code was resolved.

8.2. Case Study 2: Faulty MAF Sensor

• Vehicle: 2018 Mercedes Sprinter
• Symptoms: P1955 code, erratic engine performance
• Diagnosis: MAF sensor readings were inconsistent. The sensor was tested with a multimeter and found to be faulty.
• Solution: The MAF sensor was replaced. After replacement, the engine performance returned to normal, and the P1955 code was resolved.

8.3. Case Study 3: Leaks in the Intake Air System

• Vehicle: 2017 Mercedes Sprinter
• Symptoms: P1955 code, poor fuel economy
• Diagnosis: A smoke test revealed leaks in the intake air system.
• Solution: The damaged hoses and pipes were replaced. After replacement, the leaks were fixed, the fuel economy improved, and the P1955 code was resolved.

9. Additional Resources

9.1. Online Forums and Communities

Engaging with online forums and communities can provide valuable insights and support for diagnosing and repairing the P1955 fault code.

9.2. Manufacturer Service Manuals

Manufacturer service manuals provide detailed information on diagnostic and repair procedures.

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The AdBlue system reduces NOx emissions by injecting a urea-based solution into the exhaust stream. It monitors NOx levels and adjusts the injection rate to minimize emissions.

14. FAQ: P1955 Mercedes Sprinter Fault Code

Here are some frequently asked questions about the P1955 Mercedes Sprinter fault code:

1. What does the P1955 code mean?
The P1955 code indicates a problem with the diesel particulate filter (DPF) regeneration or intake air system in a Mercedes Sprinter.

2. What are the common causes of the P1955 code?
Common causes include a clogged DPF, faulty DPF sensors, leaks in the intake air system, and a faulty MAF sensor.

3. Can I fix the P1955 code myself?
Simple issues like loose hoses can be fixed, but complex problems require professional diagnosis and repair.

4. How do I diagnose the P1955 code?
Use an OBD-II scanner to read the fault codes, monitor live data, and perform component testing.

5. What tools are needed to diagnose and repair the P1955 code?
An OBD-II scanner, multimeter, smoke machine, compression tester, and cylinder leakage tester are essential.

6. How do I perform a forced DPF regeneration?
Connect an OBD-II scanner to the vehicle and follow the on-screen instructions to initiate the regeneration process.

7. How do I clean a DPF?
Remove the DPF, soak it in a specialized cleaning solution, rinse it thoroughly, and dry it completely before reinstalling.

8. How do I replace a MAF sensor?
Disconnect the electrical connector, remove the old sensor, install the new sensor, and reconnect the electrical connector.

9. What is the role of AutoExplain.com in fixing the P1955 code?
AutoExplain.com provides expert remote technical support, including fault code diagnosis, live data analysis, and repair procedures.

10. How can I contact AutoExplain.com for support?
You can contact us via WhatsApp at (+84)967469410, email at [email protected], or through our website at AutoExplain.com.

By understanding the P1955 Mercedes Sprinter fault code and its common causes, you can effectively diagnose and repair the issue, ensuring your vehicle operates at its best. AutoExplain.com is here to provide expert technical support and guidance throughout the process. Contact us today for unparalleled automotive technical assistance.