Fault codes
The most common catalytic converter, oxygen sensor and DPF fault codes: what they mean, what causes them and whether restoration helps. A code shows where to look, but we make the final decision after diagnostics and measurement.
Catalytic converter efficiency
Based on the oxygen sensor signals, the engine control unit has decided that the converter is not working well enough.
Clogged DPF
The filter is clogged with soot or ash and restricts the exhaust gas flow. If the ceramic is intact, it can usually be restored.
Damaged DPF or pressure pipes
The filter traps too little, or the pressure difference is too low. The pipes and the sensor have to be ruled out first.
Oxygen sensor after the converter
The sensor after the converter monitors how the converter works. These codes usually point to the sensor or its circuit, not to the converter itself.
- P0136Oxygen sensor after the converter - circuit malfunction (bank 1, sensor 2)Most likely not the catalytic converter
- P0137Oxygen sensor after the converter - low voltage (bank 1, sensor 2)Most likely not the catalytic converter
- P0138Oxygen sensor after the converter - high voltage (bank 1, sensor 2)Most likely not the catalytic converter
- P0139Oxygen sensor after the converter - slow response (bank 1, sensor 2)Most likely not the catalytic converter
- P0140Oxygen sensor after the converter - no signal (bank 1, sensor 2)Most likely not the catalytic converter
- P0141Oxygen sensor after the converter - heater circuit (bank 1, sensor 2)Most likely not the catalytic converter
Fuel vapour system (EVAP)
The system collects fuel vapour from the tank and sends it to the engine to be burned. It has nothing to do with the exhaust catalytic converter.
A code shows where to look, but it is not a final diagnosis. We make the decision at the workshop after diagnostics and measurement.
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