P23F6 code meaning
Cylinder 5 Injector B Air-Fuel Ratio Imbalance
Powertrain system Generic code P23xx codes Check engine light
What P23F6 means
P23F6 flags cylinder 5 and is the first code in this row that a four-cylinder engine can never set. Engines with port plus direct injection and at least five cylinders are mostly V6 and V8 units: Ford's second-generation 3.5 EcoBoost V6, first shown in the 2017 Ford GT, Toyota's 2GR-FKS V6 with D-4S, and the V8s named at P23F8. On the Lamborghini Huracán V10, which combines direct and multi-point injection, cylinder 5 closes the first group of five. The code means the trim of that single cylinder points to its injector B, which in these designs is the port injector. Nobody publishes P23F6 with a threshold. Confirm the maker's numbering, then compare P21A0 and the misfire counter P0305 before replacing the injector.
P23F6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P23F6
- Check engine light on
- Usually no change in performance
- Fuel trim of the affected bank drifts
Common causes of P23F6
- Most likelyPort injector of cylinder 5 out of tolerance
- PossibleIntake manifold gasket leaking near cylinder 5
- Less likelyIntermittent contact in the injector B wiring of cylinder 5 (P21D3)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injector b cyl 5
What each part of P23F6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| F6 | The exact fault in that area. |
What to do next
- Note P23F6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P23F6
What does P23F6 mean?
P23F6 means "Cylinder 5 Injector B Air-Fuel Ratio Imbalance". P23F6 flags cylinder 5 and is the first code in this row that a four-cylinder engine can never set. It is a generic code, so it means the same on every make.
Is it safe to drive with P23F6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P23F6 fail an emissions test?
Yes, it can. P23F6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P23F6 to fix?
Difficulty: medium. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P23F6 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.