P219C code meaning
Cylinder 1 Air-Fuel Ratio Imbalance
Powertrain system Generic code P21xx codes Check engine light
What P219C means
P219C names cylinder 1 as the one whose mixture departs from the others. Not every system can do that: CARB lets the stored code point only as far as the monitoring method allows, so many engines just log P219A or P219B. Those that resolve single cylinders include Toyota (the 2014 Corolla 2ZR gained P219C to P219F) and VW, whose 2014 2.5 litre five-cylinder leans each cylinder in turn and judges the resulting roughness, flagging a ratio below 0.19 or above 1.50. Subaru reflashed 2019 to 2020 Crosstrek Hybrid ECMs because P219C to P219F set without a real fault. Where the fault is real, check the cylinder 1 injector, its intake port seal and valve tightness with a leak-down test, as Toyota prescribes for the 2015 Tacoma V6. Cylinder numbering differs between makers, so confirm which cylinder is number 1.
P219C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P219C
- Check engine light on
- Often no noticeable symptom
- Possible P0301 or rough idle if cylinder 1 deviates strongly
Common causes of P219C
- Most likelyCylinder 1 injector clogged, leaking or out of tolerance
- PossibleValve leakage on cylinder 1 (leak-down test)
- PossibleIntake runner or injector seal leak at cylinder 1
- Less likelyFalse detection fixed by ECM reprogramming (e.g. Subaru Crosstrek Hybrid)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorIntake manifold
What each part of P219C 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. |
| 9C | The exact fault in that area. |
What to do next
- Note P219C 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 P219C
What does P219C mean?
P219C means "Cylinder 1 Air-Fuel Ratio Imbalance". P219C names cylinder 1 as the one whose mixture departs from the others. It is a generic code, so it means the same on every make.
Is it safe to drive with P219C?
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 P219C fail an emissions test?
Yes, it can. P219C 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 P219C to fix?
Difficulty: medium. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P219C 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.