VOLVO
ECM-2210 - Rear heated oxygen sensor (HO2S), heating. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
4 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S70 (1997–2000), V70 (1997–2000)
Show models by year and engine (7)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
What does this fault code mean?
This code concerns the signal from the heating of the rear oxygen sensor being too low. The fault can lie in a broken or grounded wire, a wire shorted to voltage, the heater resistor or the sensor. The sensor heating is then blocked.
Possible causes
- Open circuit in the signal cable
- Signal cable short-circuited to ground
- Resistance too high in the heater resistor
- Signal cable short-circuited to voltage
- Defective oxygen sensor
What you can do
- 1Read the codes and note which are stored at the same time as this one
- 2Check the sensor connector for contact resistance and oxidation, and do not use rust solvent spray or grease in it
- 3Inspect the wiring to the sensor for breaks, chafing and shorts to ground or voltage
- 4Use a multimeter to check that the wire is not broken or shorted
- 5If the wiring and connector are sound but the fault remains, have a workshop try a new rear oxygen sensor
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- Heating of the rear oxygen sensor is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.