VOLVO
ECM-210E - Front heated oxygen sensor (HO2S). Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008)
Show models by year and engine (12)
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006–2008Engine B5244SG only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2006Engine B5244SG only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2003–2005Engine B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006–2008Engine B5244SG only
What does this fault code mean?
The engine control module (ECM) checks how quickly the front oxygen sensor switches between rich and lean. If the module registers a fault in the sensor's switching, the code is set. The fault is caused by a defective front oxygen sensor.
Possible causes
- Defective front oxygen sensor
What you can do
- 1Read and clear the fault code and check whether it returns
- 2Check that the connector at the front oxygen sensor is firmly seated and clean; do not use penetrating spray or grease on it
- 3If you have a diagnostic tool, read the oxygen sensor signal in live data with the engine running and see whether it switches clearly between high and low
- 4Have a workshop replace the front oxygen sensor if the fault remains
Symptoms you may notice1
- The malfunction indicator lamp (MIL) is lit
What the fault can affect1
- Fuel trim control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.