P21F6

Fuel Control System B Too Lean Off Idle Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Unstable engine operation
Increased fuel consumption
Detonation (knock) during acceleration

Causes

Air leaks in the intake tract
Malfunction of bank 2 fuel injectors
Low fuel pressure
Bank 2 oxygen sensor malfunction
Contamination or malfunction of the air flow sensor

How to Fix

Check the intake tract for air leaks
Check the operation of bank 2 fuel injectors
Measure fuel pressure
Check the condition of the oxygen sensors
Clean or replace the mass air flow sensor if necessary

Related codes

P2177 P2187 P2195 P2196