VOLVO
ECM-P005700 - HO2S Heater Control Circuit Low (Bank 2, Sensor 2). General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (13)
- Volvo S80 (2007–)2007–2010Engine B6324S, B8444S only
- Volvo S80 (2007–)2011Engine B6324S5, B8444S only
- Volvo S80 (2007–)2012–2015Engine B6324S5 only
- Volvo V70 (2008–)2008–2010Engine B6324S only
- Volvo V70 (2008–)2011–2014Engine B6324S5 only
- Volvo XC60 (2009–)2010Engine B6324S only
- Volvo XC60 (2009–)2011–2015Engine B6324S5 only
- Volvo XC70 (2008–)2008–2010Engine B6324S only
- Volvo XC70 (2008–)2011–2015Engine B6324S5 only
- Volvo XC90 (2003–)2005–2006Engine B8444S only
- Volvo XC90 (2003–)2007–2010Engine B6324S, B8444S only
- Volvo XC90 (2003–)2011Engine B6324S5, B8444S only
- Volvo XC90 (2003–)2012–2014Engine B6324S5 only
What does this fault code mean?
The engine control module monitors the preheating of the rear oxygen sensor on bank 2, sensor 2. The fault is registered when the lead is short-circuited to ground, when there is an open circuit, or when the heater resistance is wrong. While the fault is present, preheating of the rear sensor is switched off.
Possible causes
- Contact resistance or oxidation in the connectors
- The power lead is short-circuited to ground
- Open circuit in the power lead
- Damaged rear heated oxygen sensor
What you can do
- 1With the ignition on, read the fault status with a diagnostic tool once the diagnostic is complete. A status of Fault found means the fault is present now
- 2Do not use rust solvent spray or grease on the oxygen sensor connector
- 3Look for oxidation and contact resistance at the connector of the rear oxygen sensor on bank 2
- 4With a multimeter, check that the preheating lead is not short-circuited to ground and has no open circuit
- 5Replace the rear oxygen sensor if the fault remains after checking the connector and wiring
Symptoms you may notice1
- The malfunction indicator lamp lights up
What the fault can affect1
- Preheating of the rear oxygen sensor is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.