VOLVO
ECM-231C - Rear heated oxygen sensor (HO2S) aging, bank 2. Signal too high
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerS80 (1999–2006), XC90 (2003–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
Although the code is named for a high signal, it concerns the sensor not showing a rich mixture. The engine control module (ECM) changes the fuel-air mixture when the rear sensor on bank 2 does not show a rich mixture, and the code is set if the sensor still does not respond. The usual causes are a leak in the exhaust system or a worn-out sensor.
Mulige årsaker
- Leak in the exhaust system
- Damaged rear oxygen sensor
Hva du kan gjøre
- 1Read the code, clear it and road test to see whether it comes back
- 2Check the exhaust system for leaks, especially at joints and clamps
- 3Do not use rust solvent spray or grease on the sensor connector
- 4Check that the connector to the rear sensor on bank 2 is secure and clean
- 5If no fault is found, have a workshop decide whether a new rear oxygen sensor is needed, since a damaged sensor can cause this fault
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
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