VOLVO
ECM-21CD - Long-term fuel trim, idling, bank 1. Lower limit
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
Although the code is named for a lower limit, it is set when the correction at idle has nearly reached its maximum. This can be caused by leaking injectors, a damaged mass air flow sensor, contaminated engine oil or too high an oil level, or by a damaged oxygen sensor.
Possible causes
- Leaking fuel injectors
- Damaged mass air flow sensor
- Contaminated engine oil
- Oil level too high
- Damaged oxygen sensor
What you can do
- 1Check the oil level against the dipstick and see whether the oil looks contaminated
- 2Have a workshop check the fuel pressure and see whether any injector leaks, by measuring the fuel and residual pressure
- 3Have a diagnostic tool? Read the long-term fuel trim at idle with the engine warm, and see whether the value stays still near an extreme position
- 4If the other checks are done and the fault remains, have a workshop replace the oxygen sensor
Symptoms you may notice1
- The malfunction indicator lamp (MIL) comes on
General guidance for car owners. Diagnosis on the car can point to a different cause.