VOLVO
ECM-P004400 - HO2S Heater Control Circuit High (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 for the rear oxygen sensor, bank 1 sensor 3. The code is set when the circuit is short-circuited to supply voltage, meaning the lead has come into contact with a live wire. 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
- The preheating supply lead is short-circuited to voltage
- Damaged rear heated oxygen sensor
What you can do
- 1Make sure the fuses are intact. Their locations are on the fuse chart or in the instruction manual
- 2Read the fault status with a diagnostic tool after the diagnostic has run. If it shows active, the fault is still there
- 3Look for abrasion or pinch damage on the sensor lead, where it may have touched a live wire
- 4With a multimeter, check that the lead is not short-circuited to voltage
- 5If the wiring is intact but the fault remains, the rear oxygen sensor may be damaged and need replacing
Symptoms you may notice2
- The malfunction indicator lamp lights up
- The Check engine lamp and other warning lamps may behave abnormally
What the fault can affect2
- The rear oxygen sensor does not preheat
- Control of the rear oxygen sensor is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.