VOLVO
ECM-2B2A - Rear lambda probe pre-heating, bank 2. Faulty signal. Intermittent fault.
System
Motorstyring (ECM)
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1 modellS80 (1999–2006)
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Hva betyr feilkoden?
The rear oxygen sensor on bank 2 has registered a faulty signal from the preheating. The fault is intermittent, meaning it comes and goes. It has been present, but is not present right now.
Mulige årsaker
- Contact resistance and oxidation in the connections
- Signal wire short-circuited to ground
- Defective rear oxygen sensor on bank 2
Hva du kan gjøre
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check that the connector at the bank 2 oxygen sensor is secure and free from contact resistance and oxidation
- 3Look for chafing on the sensor wiring, especially where it can move, and check that it is not shorted to ground
- 4If you have a diagnostic tool: during a road test, read the status of the bank 2 sensor heater in live data and see whether it drops out
- 5If the fault returns, have a workshop check the sensor
Symptomer du kan merke1
- The malfunction indicator lamp (MIL) comes on
Hva feilen kan påvirke1
- Fuel trim control is switched off
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