P23F9

Cylinder 8 Injector B Air-Fuel Ratio Imbalance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–167 (est.)

Symptoms

Check Engine light comes on
Unstable engine idling
Reduced engine power
Increased fuel consumption
Jerks when accelerating

Causes

Malfunction of fuel injector B of cylinder No. 8
Fuel injector clogged
Problems with injector wiring or connectors
Oxygen sensor malfunction
Fuel pressure problems

How to Fix

Check the cylinder No. 8 fuel injector B wiring and connectors for damage or corrosion.
Check cylinder No. 8 fuel injector B for resistance and ensure it is within manufacturer specifications.
Clean or replace the No. 8 cylinder B fuel injector if it is clogged or faulty.
Check the fuel pressure in the system and make sure it is within normal limits.
Check the oxygen sensors and replace them if they are faulty.

Related codes

P23F8 P23FA P23FB