VOLVO
ECM-21F0 - Long-term fuel trim, bank 2. Faulty signal
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?
A collective code for fuel adaptation faults on bank 2, set when one of the underlying adaptation codes for bank 2 is stored in two consecutive driving cycles. The code is always linked to one of them, so it is the underlying fault code that should be troubleshot.
Possible causes
- Consequential fault from an underlying fault code for adaptive lambda regulation on bank 2
What you can do
- 1Troubleshoot the underlying fault codes for adaptive lambda regulation on bank 2 first and fix them
- 2Clear this code once the underlying faults are fixed, then road test the car
- 3Have a diagnostic tool? Read which bank 2 lambda codes are stored alongside this one
Symptoms you may notice1
- The engine warning lamp comes on or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.