VOLVO
ECM-P004200 - HO2S Heater Control Circuit (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 monitors the heater element of the rear oxygen sensor (bank 1, sensor 3) and its ability to warm the sensor up. It measures impedance in the heater circuit during warm-up, and the code is set when the heater circuit has an open circuit. Vehicles with two oxygen sensors cannot get this code.
Possible causes
- Contact resistance or oxidation in the terminals
- Damaged rear heated oxygen sensor
- Open circuit in the wiring to the sensor
- Blown fuse
What you can do
- 1Check that the fuses are intact. Their locations are given in the instruction manual or on the fuse chart
- 2With a diagnostic tool, read the fault status once the diagnostic is complete. A status of 'Fault found' means the fault is present now
- 3Check the connector at bank 1 sensor 3, the rear oxygen sensor, for contact resistance and oxidation. Do not use rust solvent spray or grease on the connector
- 4With a multimeter, check that the wiring to the sensor has no open circuit and no short to ground
- 5If the fault remains after checking the connector and wiring, the rear heated oxygen sensor may need replacing
Symptoms you may notice2
- Malfunction indicator lamp (MIL) lights up
- Warning lamp for faults (Check engine) lights up or behaves abnormally
What the fault can affect1
- 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.