The mixture on bank 2 has too much fuel or too little air. The driver may notice high consumption, a fuel smell or black smoke.
Likely causes, most common first
- Leaking fuel injector on bank 2
- Excessive fuel pressure
- Dirty or faulty MAF sensor
- Clogged air filter
Parts usually involved
- Fuel injectors
- Fuel pressure regulator
- MAF sensor
- Air filter
Test before you replace
Compare fuel trims on both banks and check fuel pressure before replacing a sensor.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.