P21A1

Cylinder 6 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
Power reduction
Increased fuel consumption
Dips during acceleration
Check Engine Light Is On

Causes

Dirty or faulty injectors
Air leak in intake manifold
Problems with the oxygen sensor
Ignition coil malfunction
Low cylinder compression

How to Fix

Check the condition of the fuel injectors
Diagnose intake tract leaks
Check the operation of oxygen sensors
Test the ignition coil and spark plugs
Measure the compression in the cylinder

Related codes

P21A0 P21A2 P0171 P0306