P23F7 code meaning
Cylinder 6 Injector B Air-Fuel Ratio Imbalance
Powertrain system Generic code P23xx codes Check engine light
What P23F7 means
P23F7 belongs to cylinder 6, the highest-numbered cylinder on a V6 or straight six. Toyota's GR V6 family is a typical carrier: the 2GR-FSE in the Lexus IS and GS and the later 2GR-FKS both use D-4S, in which the port injector supplies part of the fuel next to the direct injector, its share depending on load and engine speed. Ford's PFDI V6 engines follow the same idea. Because the split changes with the operating point, a faulty port injector may only show in the ranges where it delivers much of the fuel, which makes the fault hard to reproduce on a short test drive. CARB requires the imbalance check for these gasoline engines, but no manufacturer documents P23F7 itself. Read P21A1, P0306 and the circuit code P21D4 for the same injector.
P23F7 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 P23F7
- Check engine light on
- Fault comes and goes depending on driving style
- Occasional roughness at low or medium load
Common causes of P23F7
- Most likelyPort injector of cylinder 6 deviating in the ranges where it carries most of the fuel
- PossibleAir leak at the intake runner or injector seat of cylinder 6
- Less likelyInjection split calibration needing a software update
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 6
What each part of P23F7 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. |
| F7 | The exact fault in that area. |
What to do next
- Note P23F7 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 P23F7
What does P23F7 mean?
P23F7 means "Cylinder 6 Injector B Air-Fuel Ratio Imbalance". P23F7 belongs to cylinder 6, the highest-numbered cylinder on a V6 or straight six. It is a generic code, so it means the same on every make.
Is it safe to drive with P23F7?
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 P23F7 fail an emissions test?
Yes, it can. P23F7 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 P23F7 to fix?
Difficulty: medium. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P23F7 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.