P219A code meaning
Bank 1 Air-Fuel Ratio Imbalance
Powertrain system Generic code P21xx codes Check engine light
What P219A means
P219A means the ECM sees mixture differences between the cylinders of bank 1 that are large enough to raise emissions, even if the bank average is fine. CARB phased this monitor in from 25 % of 2011 to all 2014 model-year gasoline vehicles (13 CCR 1968.2 (e)(6.2.1)(C)). GM measures how much the upstream sensor signal varies per firing event, normalises the result against a map of a healthy engine and flags a ratio above 1.05 (one 2016 engine, 1100 to 3500 rpm, Type A, one trip). Mitsubishi counts rich and lean peaks at 1750 to 3250 rpm and 40 to 70 % volumetric efficiency. On inline engines bank 1 is the whole engine. Toyota traced P219A on 2012 to 2014 Corolla 2ZR engines to compression escaping into the exhaust; from 2014 the Corolla adds the cylinder codes P219C to P219F.
P219A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P219A
- Check engine light on
- Often no noticeable symptom
- Slight rough running or misfire codes when one cylinder is far off
Common causes of P219A
- Most likelyOne injector clogged, leaking or out of flow tolerance
- PossibleCompression loss through an intake or exhaust valve
- PossibleAir leak at one intake runner or gasket
- Less likelyECM logic or sensor signal issue covered by software or wiring bulletins
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorOxygen sensorIntake manifold
What each part of P219A 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. |
| 9A | The exact fault in that area. |
What to do next
- Note P219A 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 P219A
What does P219A mean?
P219A means "Bank 1 Air-Fuel Ratio Imbalance". P219A means the ECM sees mixture differences between the cylinders of bank 1 that are large enough to raise emissions, even if the bank average is fine. It is a generic code, so it means the same on every make.
Is it safe to drive with P219A?
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 P219A fail an emissions test?
Yes, it can. P219A 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 P219A to fix?
Difficulty: medium. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P219A 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.