VOLVO
ECM-P014084 - O2 Circuit No Activity Detected (Bank 1, Sensor 2). Bus Signal / Message Failures. Signal below 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 rear oxygen sensor in bank 1, sensor 2, which does not show a lean mixture in time. The engine control module (ECM) checks the sensor and changes the mixture if it does not show lean. At fuel cut-off the sensor should 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
- 2Look for air leaks in the exhaust system, especially at joints and gaskets
- 3Avoid rust solvent spray and grease in the connector to the rear sensor
- 4If the exhaust is sealed, try a new rear oxygen sensor; a damaged sensor can also set the code
Symptoms you may notice1
- Check engine light (MIL) on
General guidance for car owners. Diagnosis on the car can point to a different cause.