P23FF

Bank 2 System B Air-Fuel Ratio Imbalance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Increased fuel consumption
Reduced engine power
Unstable engine operation
Check Engine light comes on
Increased emissions of harmful substances

Causes

Air leaks in the intake tract
Oxygen sensor malfunction (Bank 2, System B)
Problems with fuel injectors
Malfunction of the mass air flow sensor (MAF)
Dirty or faulty spark plugs

How to Fix

Check the tightness of the intake tract for air leaks
Check the condition and operation of the oxygen sensor (bank 2, system B)
Check fuel injectors for contamination or malfunction
Check the condition of the mass air flow sensor (MAF)
Check and replace spark plugs if necessary

Related codes

P23FE P23FD P23FC