P23FE code meaning
Bank 1 System B Air-Fuel Ratio Imbalance
Powertrain system Generic code P23xx codes Check engine light
What P23FE means
P23FE reports a cylinder-to-cylinder imbalance on bank 1 that the control unit attributes to fuel system B, without naming a cylinder. Ford's 2024 OBD summary explains the letter for its dual-injection engines: the port path is Fuel Control System B with its own lean and rich codes (P2BF0/P2BF1 for bank 1), while direct injection forms system A. Ford's imbalance monitor itself still stores only P219A: it runs once per trip in closed loop after the fuel monitor has adapted, needs 300 to 700 s and fails above an imbalance ratio of 0.75. No manufacturer publishes P23FE. An inline engine has only bank 1, so the code then covers all its cylinders; on V engines it is the side with cylinder 1. A system-wide B code points to the port rail, its pressure or several port injectors at once.
P23FE 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 P23FE
- Check engine light on
- Lean or rich fuel trim on bank 1, possibly P2BF0 or P2BF1
- Slightly increased fuel consumption
Common causes of P23FE
- Most likelySeveral port injectors on bank 1 fouled by deposits
- PossiblePort fuel rail pressure or low-pressure supply wrong on bank 1
- PossibleIntake manifold leak on the bank 1 side
- Less likelyFront oxygen sensor of bank 1 responding poorly
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel system b b1
What each part of P23FE 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. |
| FE | The exact fault in that area. |
What to do next
- Note P23FE 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 P23FE
What does P23FE mean?
P23FE means "Bank 1 System B Air-Fuel Ratio Imbalance". P23FE reports a cylinder-to-cylinder imbalance on bank 1 that the control unit attributes to fuel system B, without naming a cylinder. It is a generic code, so it means the same on every make.
Is it safe to drive with P23FE?
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 P23FE fail an emissions test?
Yes, it can. P23FE 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 P23FE to fix?
Difficulty: medium. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P23FE 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.