VOLVO
ECM-232B - Rear heated oxygen sensor (HO2S), bank 2. Signal missing
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?
The engine control module (ECM) follows the signal from the rear oxygen sensor on bank 2. The code is set when the signal disappears or moves outside its range, or when the heating of the sensor disturbs it. Meanwhile, control of the oxygen sensor after the catalytic converter is switched off.
Mulige årsaker
- Poor contact or oxidation in the sensor connector
- Open circuit in the signal wire
- Open circuit in the ground wire
- Damaged rear oxygen sensor
Hva du kan gjøre
- 1Read the code, clear it and road test to see whether it returns
- 2Look at the connector to the sensor on bank 2 and check it for oxidation or play
- 3Use a multimeter to check that the signal and ground wires to the sensor have no break
- 4If you have a diagnostic tool: watch the sensor signal in live data while the engine runs and confirm that it moves
- 5If the fault remains, have a workshop decide whether a new rear oxygen sensor is needed
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
Hva feilen kan påvirke2
- Oxygen sensor control after the catalytic converter is switched off
- Catalytic converter diagnostics are switched off
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