P230FCylinder 6 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
- P230F is the balance-limit code for cylinder 6 and can only appear on engines with six or more cylinders, inline sixes, V6 units and larger. On a V6, cylinder 6 shares its bank and front oxygen sensor with two others, so its individual trim has to be estimated from that bank signal or from crankshaft speed. No maker documents P230F publicly, and no NHTSA bulletin mentions it. The series jumps from here to P231A for cylinder 7, because P2310 to P2319 are taken by ignition coil codes. Mercedes, which uses the series on its AMG M177 V8, shows that such a code can also be a software matter. Checks for cylinder 6 follow the usual order: injector delivery, intake sealing at that port, compression and valve tightness. P21A1 and P0306 belong to the same cylinder.
- What you may notice
- Check engine light on
- Rough idle, possibly misfire on cylinder 6
- Higher fuel consumption or exhaust smell
- Likely causes
- LikelyInjector of cylinder 6 delivering too much or too little (deposits, wear)
- PossibleAir leak at the intake port or injector seal of cylinder 6
- PossibleValve of cylinder 6 not sealing (worn seat or guide), low compression
- RarePoor contact at the connector of injector 6
- 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.