VOLVO
ECM-P208421 - Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2. General Signal Failures. Signal too low
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 (8)
- Volvo S60 (2011–)2014–2015Engine D4204T5 only
- Volvo S80 (2007–)2014–2015Engine D4204T5 only
- Volvo V40 (2013–)2015Engine D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine D4204T14 only
- Volvo V60 (2011–)2014–2015Engine D4204T5 only
- Volvo V70 (2008–)2014–2015Engine D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine D4204T5 only
What does this fault code mean?
The code is set when the sensor after the catalytic converter reads a value that differs from the calculated one. The engine control module monitors this while the engine is running.
Possible causes
- Loose connection or oxidation in the connections
- Short circuit to ground in the signal wire
- Damaged exhaust temperature sensor after the catalytic converter
What you can do
- 1If you have a diagnostic tool: start the engine and read the sensor value in live data, and check that it is steady
- 2Check that the connectors to the sensor after the catalytic converter are secure and free from oxidation
- 3Use a multimeter to check that the signal wire has no short circuit to ground
- 4Check that the sensor wiring is not chafed or pinched
- 5If the fault remains, have a workshop measure the sensor resistance and replace the sensor if needed
Symptoms you may notice1
- Check engine warning lamp lights or behaves abnormally
What the fault can affect1
- A calculated value is used instead of the sensor signal
General guidance for car owners. Diagnosis on the car can point to a different cause.