VOLVO
ECM-4901 - Three-way catalytic converter (TWC) efficiency, bank 2. Intermittent fault
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
1 modellS80 (1999–2006)
Hva betyr feilkoden?
The catalytic converter on bank 2 deviated too much at an earlier point, but the engine control module can no longer detect the fault. The fault is intermittent, meaning it comes and goes, and it may already be gone when you read the code.
Mulige årsaker
- Misfiring in the engine
- Air leak in the intake on bank 2
- Leak in the exhaust system
- Fuel pressure is wrong
- Uneven compression in the engine
- Catalytic converter is defective
Hva du kan gjøre
- 1Read off the fault code and note it, erase it and test-drive to see whether it returns
- 2If it does not return, the fault is probably temporary, and no further troubleshooting is needed beyond keeping an eye on it
- 3Check the intake and exhaust systems for leaks such as cracks or loose joints
- 4Have a workshop check fuel pressure and compression if the fault comes back
Symptomer du kan merke1
- Emissions warning lamp (MIL) lit
Hva feilen kan påvirke1
- Control of the rear oxygen sensor is switched off
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