VOLVO
ECM-0140 - Rear heated oxygen sensor (HO2S), bank 1. Signal missing
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 signal from the rear lambda sensor on bank 1 is missing and treats this as a fault. With no signal, the control module cannot read the rear sensor's measurement. The cause is most often an open circuit or a short in the signal wire, but a damaged sensor or control module can also cause it.
Mulige årsaker
- Open circuit in the signal wire
- Signal wire shorted to ground
- Signal wire shorted to supply voltage
- Signal wire shorted to reference voltage
- Damaged rear lambda sensor
- Damaged control module
Hva du kan gjøre
- 1Read, note and clear the code, then road test
- 2Check that the connectors at the rear lambda sensor are fully engaged and not oxidized
- 3With the connector unplugged, use a multimeter to check that the signal wire has no connection to ground (the body)
- 4Follow the signal wire from the sensor and look for breaks or chafing, especially near the exhaust pipe
- 5If you have a diagnostic tool, read the rear sensor value in live data. If the value is missing entirely or never changes, the signal is gone
- 6If the fault returns, have a workshop with diagnostic equipment check the control module and decide whether the sensor needs replacing
Symptomer du kan merke1
- Malfunction indicator lamp (MIL) lit
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