CAT / O2 OFF Service
Unlock true exhaust flow and eliminate Check Engine Light after catalytic converter removal with professional CAT / O2 OFF ECU tuning by AutoExplain.
CAT/02 OFF meaning
WHAT IS CAT / O2 OFF?
CAT / O2 Off (Catalyst Delete & Oxygen Sensor Disable) is an ECU software calibration that disables catalyst efficiency monitoring and downstream oxygen sensor logic after the catalytic converter has been removed or replaced with a high-flow downpipe.
Modern petrol engines rely on Lambda (O2) sensors and catalytic converters to meet emission standards. However, these components also introduce exhaust backpressure and ECU limitations that restrict performance and exhaust sound.
At AutoExplain, CAT / O2 Off is performed purely via ECU software, ensuring stable operation without warning lights or limp mode.
Our CAT O2 Off remap Service
WHEN DO YOU NEED CAT / O2 OFF?
CAT / O2 Off is recommended if:
- You have removed the catalytic converter
- You installed a decat or high-flow downpipe
- Your car shows Check Engine Light (CEL) after exhaust modification
- You experience DTCs like P0420 / P0430
- You want improved exhaust sound and throttle response
- You plan to combine with Stage 1 / Stage 2 tuning
This service is common for performance builds, track cars, and off-road vehicles.
Our O2 OFF Service
BENEFITS OF CAT / O2 OFF ECU TUNING
- Eliminates Check Engine Light after CAT removal
- Removes exhaust backpressure → better engine breathing
- Improves throttle response and power delivery
- Enhances exhaust sound (deeper & more aggressive)
- Required for performance downpipes & turbo upgrades
- Stable operation without limp mode
CAT / O2 Off increases emissions and may not comply with road regulations. Recommended for motorsport or off-road use only.
CAT O2 Off Service at AutoExplain
WHAT DOES CAT / O2 OFF INCLUDE?
A CAT / O2 Off service at AutoExplain typically includes:
Downstream O2 sensor (Lambda 2) logic disable
Catalyst efficiency monitoring deactivation
Removal of CAT-related DTCs (e.g. P0420 / P0430)
Fuel and ignition adjustment for freer exhaust flow
Boost control optimization (turbo engines)
Exhaust gas temperature (EGT) protection strategy
Full checksum correction
All non-related ECU functions remain fully intact.
CAT / O2 Off Service at AutoExplain
WHAT WE NEED TO ASSESS YOUR CAT / O2 OFF SERVICE?
What We Need to Support You?
- Vehicle Information
- ECU Type
- Original ECU File
- Exhaust Configuration
- Fault Codes (If Any)
- Usage Purpose
Our Proccess
HOW DOES CAT / O2 OFF WORK?
Our CAT / O2 Off ECU calibration follows a strict technical workflow:
01
Vehicle & ECU Health Check
Diagnostics to verify engine and exhaust condition
02
Original ECU File Reading
ORI file read via OBD / Bench / Boot mode
03
Lambda & Catalyst Logic Disable
O2 sensor feedback and catalyst monitoring removed
06
Testing & Verification
Road test and data validation (no CEL, no limp mode)
05
Checksum Correction & Flashing
Stable flashing with verified checksum
04
ECU Calibration Optimization
Fuel, ignition, boost, and exhaust-related maps adjusted
AUTOEXPLAIN PERFORMANCE WITHOUT COMPROMISE
At AutoExplain, we deliver professional ECU tuning solutions for performance-focused vehicles worldwide—combining technical precision, safety logic, and real-world reliability.
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AutoExplain - YOUR TRUSTED ASSISTANT
WARRANTY & SUPPORT
At AutoExplain, every Stage 1 ECU remap is delivered with a clear warranty and dedicated after-service support to ensure confidence, safety, and long-term reliability.
CAT / O2 Off Software Warranty
Verified ECU calibration with checksum integrity.
Post-Service Technical Support
Support for exhaust-related fault codes and adjustments.
Aftercare & File Optimization
Fine-tuning support to ensure stable long-term operation.
WHAT CUSTOMERS SAY ABOUT AUTOEXPLAIN‘S SERVICE
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