P230D

Cylinder 4 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

Unstable engine idling
Increased fuel consumption
Reduced engine power
Misfire in cylinder 4
Check Engine Light Illuminates

Causes

Dirty or faulty fuel injectors
Vacuum leaks in the intake system
Problems with the ignition system (plugs, coils)
Low fuel pressure
Oxygen sensor malfunction

How to Fix

Check the condition of the fuel injectors and clean or replace if necessary.
Check the tightness of the intake system for leaks
Check the condition of the spark plugs and coils
Check the fuel pressure in the system
Check the functionality of the oxygen sensors

Related codes

P230C P230E P0171 P0172