VOLVO
ECM-254C - Front heated oxygen sensor (HO2S), bank 2, heating. 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?
The engine control module (ECM) heats the front oxygen sensor on bank 2 by pulsing the current to its heating element. While the heating is active, the sensor signal should stay below a certain value. If the signal is above that value, the code is set.
Mulige årsaker
- Signal wire short-circuited to supply voltage
- Damaged front oxygen sensor on bank 2
Hva du kan gjøre
- 1Read the code, clear it and road test the car to see whether it returns
- 2Check that the lambda sensor connector is clean and fully engaged. Do not use rust solvent spray or grease on it
- 3Use a multimeter to check that the signal wire has no voltage to ground when the control module is disconnected
- 4Look for chafing and places where the signal wire may have been pinched or worn against a sharp edge
- 5If the wire is intact the sensor may be damaged; have a workshop check it or replace it
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) on
Hva feilen kan påvirke1
- Oxygen sensor control is switched off
Generell veiledning for bileiere. Feilsøking på bilen kan peke på en annen årsak.