VOLVO
ECM-290A - Front heated oxygen sensor (HO2S), bank 2. Signal too high
System
Motorstyring (ECM)
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Feilkoden har ulik betydning avhengig av modell, årsmodell eller motor. Velg betydningen som gjelder din bil.
Gjelder følgende modeller:
2 modellerS80 (1999–2006), XC90 (2003–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
The fault concerns the front oxygen sensor on bank 2, which gives too high a signal. The control module compares the adaptation values of the front and rear sensors, and when they differ by more than the permitted amount the fault may lie in the front or rear sensor circuit.
Mulige årsaker
- Air leakage in the exhaust system
- Signal cable or pump current wire touching supply voltage or ground
- Defective oxygen sensor
Hva du kan gjøre
- 1Check the exhaust system for air leaks, for example at joints and around the oxygen sensors
- 2Check the sensor wiring for chafing and pinching, and look for places where it could touch supply voltage or ground
- 3Do not use rust solvent or grease on the sensor connector
- 4If the wiring is in order and no fault is found, have a workshop replace both front oxygen sensors
- 5If the fault remains, it may be in the circuit of the rear sensor, so have that checked too
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
Hva feilen kan påvirke2
- Rear oxygen sensor control is switched off
- Catalytic converter diagnostics are switched off
Generell veiledning for bileiere. Feilsøking på bilen kan peke på en annen årsak.