VOLVO
ECM-P014085 - O2 Circuit No Activity Detected (Bank 1, Sensor 2). Bus Signal / Message Failures. Signal above allowable range
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsS60 (2011–), S80 (2007–), V70 (2008–)
Show models by year and engine (9)
- Volvo S60 (2011–)2011–2012Engine B5254T5 only
- Volvo S80 (2007–)2007–2008Engine B5254T6 only
- Volvo S80 (2007–)2009Engine B5254T6, B5254T8 only
- Volvo S80 (2007–)2010–2011Engine B5254T10, B5254T11, B5254T8 only
- Volvo S80 (2007–)2012Engine B5254T10 only
- Volvo V70 (2008–)2008Engine B5254T6 only
- Volvo V70 (2008–)2009Engine B5254T6, B5254T8 only
- Volvo V70 (2008–)2010–2011Engine B5254T10, B5254T11 only
- Volvo V70 (2008–)2012Engine B5254T10 only
What does this fault code mean?
Although the code is named for a bus or message fault, it concerns the signal from the rear oxygen sensor in bank 1, sensor 2. The control module checks that the sensor shows a rich mixture and changes the mixture if it does not. At fuel cut-off the sensor should also show lean, and if the switch takes too long the code is set.
Possible causes
- Leak in the exhaust system
- Damaged rear oxygen sensor
What you can do
- 1Read the code, clear it and road test the car to see whether it comes back
- 2Check the exhaust system for air leaks before replacing anything
- 3Check the connector to the rear sensor for contact resistance and oxidation
- 4If no leak is found, replace the rear oxygen sensor
Symptoms you may notice1
- Check engine light (MIL) on
General guidance for car owners. Diagnosis on the car can point to a different cause.