P0068MAP/MAF - Throttle Position Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The engine control module compares the air quantity measured by the manifold pressure and/or mass air flow sensor with the quantity the throttle position leads it to expect. P0068 is set when they do not match, typically because more air arrives than the nearly closed throttle allows, i.e. an air leak behind the throttle, or because the throttle body is dirty or a sensor reads wrong. On engines with electronic throttle this check protects throttle control, so the engine often goes into reduced power. Each sensor can be electrically fine on its own; regulations require such plausibility checks for input sensors with a code of their own.
- What you may notice
- Check engine light on
- Reduced power mode
- Rough or unstable idle
- Jerking
- Likely causes
- LikelyAir leak behind the throttle: intake manifold, vacuum or MAP hoses
- LikelyThrottle body dirty
- PossibleMass air flow or manifold pressure sensor faulty
- PossibleEngine control software (manufacturer updates exist)
- RareCamshaft timing out of position
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.