P21A5

Cylinder 10 Air-Fuel Ratio Imbalance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Uneven engine operation
Increased fuel consumption
Power Loss
Check Engine light comes on
Possible misfires

Causes

Clogging or malfunction of the injector of the 10th cylinder
Vacuum leak in the area of the 10th cylinder
Problems with the oxygen sensor
Fuel pump malfunction
Damage to the wiring harness to the injector

How to Fix

Check the condition of the injector of the 10th cylinder
Diagnose the system for air leaks
Check the operation of oxygen sensors
Test the fuel pump
Inspect the wiring harness for damage

Related codes

P21A0 P21A1 P21A2