VOLVO
ECM-P004300 - HO2S Heater Control Circuit Low (Bank 1, Sensor 3). General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (15)
- Volvo S60 (2011–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo S80 (2007–)2010Engine B6324S2 only
- Volvo S80 (2007–)2011–2013Engine B6324S4 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15, B6324S4 only
- Volvo V40 (2013–)2015Engine B4204T11 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo V70 (2008–)2010Engine B6324S2 only
- Volvo V70 (2008–)2014–2015Engine B4204T11 only
- Volvo XC60 (2009–)2010Engine B6324S2 only
- Volvo XC60 (2009–)2011–2013Engine B6324S4 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, B6324S4 only
- Volvo XC70 (2008–)2010Engine B6324S2 only
- Volvo XC70 (2008–)2011–2013Engine B6324S4 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11, B6324S4 only
What does this fault code mean?
The engine control module checks the preheating circuit of the rear heated oxygen sensor (bank 1, sensor 3). The code is set when the circuit is short-circuited to ground or when the resistance of the heater element is wrong. The fault can only be detected once the test has started and the conditions are met. Vehicles with two oxygen sensors cannot get this code.
Possible causes
- Contact resistance and oxidation in the terminals
- Power lead to the sensor short-circuited to ground
- Open circuit in the power lead to the sensor
- Damaged rear heated oxygen sensor
What you can do
- 1Make sure the fuses are intact. If you cannot find their positions, they are in the instruction manual
- 2With a diagnostic tool, read the fault status once the diagnostic is complete. A status of Fault found means the fault is present now
- 3Look at the sensor connector for oxidation and loose contacts. Spray or grease does not belong in the connector
- 4With a multimeter, check that the preheating lead is not short-circuited to ground and has no open circuit
- 5If the fault stays after checking the connector and wiring, replace the oxygen sensor. Then read the fault status again
Symptoms you may notice2
- The malfunction indicator (MIL) lamp lights up
- Warning lamps and warning chimes may behave abnormally
What the fault can affect2
- The rear heated oxygen sensor does not preheat
- Control of the rear heated oxygen sensor is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.