VOLVO
ECM-P117900 - Fuel/Air Mixture Unstable during Quick Test of Fuel Trim. General Failure Information. No sub type information
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?
The code is set during the workshop quick test of lambda control, when the fuel-air mixture varies considerably for a certain time. The test is used to find air leaks or low fuel pressure, among other things. An unstable mixture may mean there is a fault that could cause lambda control codes during normal driving.
Possible causes
- Damaged oxygen sensor (HO2S)
- Air leak in the intake system
- Air leak in the exhaust system
- Damaged mass airflow meter
- Incorrectly calculated ethanol content
What you can do
- 1Look for air leaks in both the intake and the exhaust system, for example at hoses and joints
- 2Inspect the mass airflow meter for damage and check that its connector is firmly seated
- 3If the fault remains after these checks, have a workshop check the oxygen sensor and the ethanol calculation
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.