VOLVO
ECM-211D - Long-term fuel trim, bank 2. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (1999–2006), XC90 (2003–)
Show models by year and engine (2)
What does this fault code mean?
The engine control module (ECM) has had to correct the fuel mixture for the bank 2 oxygen sensor so much that the long-term correction has nearly reached its upper limit at upper part load. The mixture therefore deviates strongly from the target, and the cause can be an air leak, a fuel system fault or a sensor that does not measure correctly.
Possible causes
- Air leakage in the intake system, for example through the EVAP valve or the hose to the brake booster
- High fuel pressure
- Leaking fuel injectors
- Damaged mass air flow (MAF) sensor
- Contaminated engine oil or oil level too high
- Damaged heated oxygen sensor (HO2S) on bank 2
What you can do
- 1Read and note the code, clear it and road test the car to see whether it returns
- 2Inspect the intake hoses, connections and clamps for cracks and loose parts, and check the hose to the brake booster too
- 3Check that the oil level is between the min and max marks on the dipstick, and that the oil does not look cloudy or smell of fuel
- 4Look for fuel smell and leaks at the fuel lines
- 5Have a diagnostic tool? Follow the long-term fuel trim for bank 2 in live data at idle with the engine warm, and compare with bank 1
- 6If the fault returns, have a workshop measure the fuel pressure and check the injectors, the mass air flow sensor and the bank 2 oxygen sensor
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.