P21FE

Fuel Control System B Too Lean at Higher Load Bank 2

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Loss of power during acceleration
Unstable engine operation under load
Increased fuel consumption
Possible popping noises in the exhaust system
Check Engine Light Is On

Causes

Air leak in the intake tract after the mass air flow sensor
Malfunction of the fuel pump or clogged fuel filter
Dirty or faulty fuel injectors
Problems with oxygen sensors (bank 2)
Malfunction of mass air flow sensor or absolute pressure sensor

How to Fix

Check the tightness of the intake tract after the mass air flow sensor
Diagnose pressure in the fuel system
Check the condition and performance of fuel injectors
Test bank 2 oxygen sensors
If necessary, replace faulty components

Related codes

P2177 P2187 P2195