VOLVO
ECM-2110 - Front 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:
7 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
Show models by year and engine (19)
- 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 S60 (2001–2009)2001, 2009Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2003–2005Engine B5244S, B5244S2, B5244S6, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006Engine B5244S, B5244S2, B5244S6, B5244SG only
- Volvo S60 (2001–2009)2007–2008Engine B5244S, B5244S2, B5244SG only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001, 2006Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002–2005Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001, 2007–2008Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2003–2005Engine B5244S, B5244S2, B5244S6, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006Engine B5244S, B5244S2, B5244S6, B5244SG only
What does this fault code mean?
The engine control module (ECM) checks the heater circuit of the front oxygen sensor shortly after the ignition is switched on. If the circuit is short-circuited to ground or supply voltage, or has an open circuit, the code is set. The fault can come from the wiring to the sensor or from a damaged sensor.
Possible causes
- Signal wire short-circuited to supply voltage
- Open circuit in the signal wire
- Signal wire short-circuited to ground
- Damaged oxygen sensor or damaged sensor control circuit
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 free from oxidation; do not use penetrating spray or grease on it
- 3Check the wiring to the oxygen sensor for chafing, pinch damage and loose contacts
- 4Use a multimeter to check that the heater wire to the oxygen sensor has no open circuit and is not short-circuited to ground or supply voltage
- 5Have a workshop replace the oxygen sensor if the fault remains after these checks
Symptoms you may notice1
- The malfunction indicator lamp (MIL) is lit
What the fault can affect1
- Fuel trim and the front sensor heater are switched off after repeated restart attempts by the sensor control
General guidance for car owners. Diagnosis on the car can point to a different cause.