VOLVO
ECM-0139 - Rear heated oxygen sensor (HO2S), bank 1. Slow control
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
3 modellerC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Vis modeller per årsmodell og motor (3)
Hva betyr feilkoden?
The engine control module registers that the rear lambda sensor on bank 1 responds too slowly to changes in the fuel-air mixture and treats this as a fault. The usual reasons are poor contact in the connections or a worn sensor. The fault lights the lamp during driving.
Mulige årsaker
- Contact resistance and oxidation in the connections
- Damaged rear lambda sensor
Hva du kan gjøre
- 1Read, note and clear the code, then road test
- 2Check the rear lambda sensor connector and the wire connection to the control module: is it fully engaged and free from oxidation?
- 3Clean oxidized contacts at the connector and make sure the locking tab engages properly
- 4If you have a diagnostic tool, watch the rear sensor value in live data while pressing and releasing the accelerator. A slow response confirms the fault
- 5If cleaning the contacts makes no difference, have a workshop with diagnostic equipment decide whether the rear lambda sensor should be replaced
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
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