P219F code meaning
Cylinder 4 Air-Fuel Ratio Imbalance
Powertrain system Generic code P21xx codes Check engine light
What P219F means
P219F singles out cylinder 4, the last cylinder on four-cylinder engines. Infiniti issued a bulletin for 2017 to 2018 QX60 with the direct-injection VQ35DD that stored only P219F without any driveability complaint; the remedy was ECM reprogramming followed by the idle air volume learn. Honda found the opposite case on 2023 to 2025 CR-V Hybrid and Accord Hybrid: a leaking injector made the mixture rich, fouled spark plugs and caused rattling and rough running, with P219C to P219F, P0172 and A/F sensor heater codes; all injectors and the fouled plugs were replaced and Honda warned against changing the A/F sensor first. Hyundai's 2018 Sonata 2.0 turbo also set P219F through software. Reading the spark plug of the flagged cylinder is a quick first check for rich or lean burning.
P219F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P219F
- Check engine light on
- Rough running or rattling noise when an injector leaks
- No symptom when the cause is software
Common causes of P219F
- Most likelyLeaking injector at cylinder 4
- PossibleOversensitive detection fixed by ECM reprogramming (e.g. Infiniti QX60, Hyundai Sonata)
- Less likelyFouled spark plug as a consequence of a rich cylinder
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injector
What each part of P219F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 9F | The exact fault in that area. |
What to do next
- Note P219F 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 P219F
What does P219F mean?
P219F means "Cylinder 4 Air-Fuel Ratio Imbalance". P219F singles out cylinder 4, the last cylinder on four-cylinder engines. It is a generic code, so it means the same on every make.
Is it safe to drive with P219F?
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 P219F fail an emissions test?
Yes, it can. P219F 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 P219F to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P219F 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.