VOLVO
ECM-254D - Front heated oxygen sensor (HO2S), bank 2, heating. 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?
The front oxygen sensor on bank 2 has an electric heater that the engine control module (ECM) controls with pulsed current. With the heating switched off, the signal should not fall below a certain value. If the ECM sees a signal that is too low in that state, the code is set.
Mulige årsaker
- Signal wire short-circuited to ground
- 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 connector at the lambda sensor is fully engaged and free from moisture and oxidation. Do not use rust solvent spray or grease in the connector
- 3Use a multimeter to check that the signal wire has no contact with ground (chassis) when it is disconnected from the control module
- 4Look for chafed spots on the signal wire, where it may have been pinched or rubbed against a hot or sharp edge
- 5If the wire is intact and the connector is good 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
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