P231C

Cylinder 9 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Uneven engine operation
Increased fuel consumption
Power Loss
Check Engine Light Is On
Possible misfire in cylinder 9

Causes

Malfunction of the fuel injector of cylinder 9
Problems with the ignition system in cylinder 9
Vacuum leak in the area of cylinder 9
Low compression in cylinder 9
Problems with the oxygen sensor

How to Fix

Check the condition of the fuel injector of cylinder 9
Check the ignition system (spark plugs, coils) of cylinder 9
Check the tightness of the intake tract
Measure compression in cylinder 9
Check the operation of oxygen sensors

Related codes

P231D P231B P0309