P21FC

Fuel Control System B Too Lean at Higher Load Bank 1

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Loss of power during acceleration
The engine runs rough at high speeds
Increased fuel consumption
Possible popping noises in the exhaust system
Check Engine Light Is On

Causes

Air leak in the intake tract
Malfunction of the fuel pump or pressure regulator
Dirty or faulty fuel injectors
Problems with oxygen sensors
Malfunction of mass air flow sensor or absolute pressure sensor

How to Fix

Check the intake tract for air leaks
Check fuel pressure and pump performance
Clean or replace fuel injectors
Check the operation of oxygen sensors
Check the readings of the mass air flow sensor and the absolute pressure sensor

Related codes

P2177 P2187 P2195