VOLVO
ECM-231D - Rear heated oxygen sensor (HO2S) aging, bank 2. Signal too low
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 low signal, it concerns the sensor on bank 2 not showing a lean mixture. At fuel cut-off the sensor should show a lean mixture, and the code is set if it does not, or if the change to lean takes too long. The cause may be a leak in the exhaust system or a damaged sensor.
Mulige årsaker
- Leak in the exhaust system
- Damaged rear oxygen sensor
Hva du kan gjøre
- 1Read and clear the code, then road test with stretches where the engine brakes without throttle
- 2Inspect the exhaust system for leaks, since a leak can stop the sensor responding as it should
- 3Check that the connector to the rear sensor on bank 2 is clean and secure
- 4If you have a diagnostic tool: read the oxygen sensor signal in live data while the engine brakes without throttle and see whether it shows a lean mixture
- 5If no fault is found, have a workshop decide whether a new rear oxygen sensor is needed
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
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