P230DCylinder 4 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P230D flags cylinder 4, so the engine needs at least four cylinders. The balancing function has run the individual fuel trim for that cylinder to its limit and the mixture still deviates. Audi's 2020 bulletin for the 2.0 TFSI (third-generation EA888) shows that this four-cylinder reports imbalance through the P230 series, which gives the code a real home, although the bulletin itself only names P230B and P230E. Mercedes lists irregular mixture formation at cylinder 4 among the faults caused by leaking valve seats on its M260/M264 four-cylinders. Swapping injector 4 with a neighbour shows whether the fault follows the injector; if it stays, look at intake sealing and compression. P219F and P0304 are the matching imbalance and misfire codes. The MIL comes on.
- What you may notice
- Check engine light on
- Rough idle, possibly misfire on cylinder 4
- Higher fuel consumption or exhaust smell
- Likely causes
- LikelyInjector of cylinder 4 delivering too much or too little (deposits, wear)
- PossibleAir leak at the intake port or injector seal of cylinder 4
- PossibleValve of cylinder 4 not sealing (worn seat or guide), low compression
- RarePoor contact at the connector of injector 4
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.