P21A6

Cylinder 11 Air-Fuel Ratio Imbalance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Uneven engine operation
Increased fuel consumption
Reduced engine power
Check Engine light comes on
Possible misfires

Causes

Dirty or faulty fuel injectors
Air leaks in the intake manifold
Oxygen sensor malfunction
Problems with the exhaust gas recirculation (EGR) system
Malfunction of the mass air flow sensor (MAF)

How to Fix

Check the condition of the fuel injectors of cylinder 11
Examine the intake tract for air leaks
Check the functionality of the oxygen sensor
Diagnose the EGR system
Check the MAF readings

Related codes

P21A1A5 P21A7 P21A8