P21F7

Fuel Control System B Too Rich Off Idle Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation
Black smoke from the exhaust pipe
Reduced engine power
Check Engine Light Illuminates

Causes

Oxygen sensor malfunction (bank 2)
Fuel leaking from injectors
Problems with the fuel pressure regulator
Contamination or malfunction of the air flow sensor
EVAP system malfunction

How to Fix

Check the condition of oxygen sensors (bank 2)
Diagnose fuel injectors for leaks
Check fuel pressure regulator
Clean or replace the mass air flow sensor
Check the EVAP system for leaks

Related codes

P2177 P2195 P2270