P0068
MAP/MAF - Throttle Position Correlation
The ECU detects implausibility between throttle position and the airflow or intake manifold pressure measured. At a given throttle angle the air mass deviates beyond rationality limits.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Power loss, hesitation under acceleration
- Rough or unstable idle
- Increased fuel consumption
- Possible difficulty starting
Common causes
Ordered by how often each turns out to be the cause.
- Large unmetered vacuum leakCommon
- Throttle body dirty or stickingPossible
- MAF sensor driftPossible
Parts involved
- Throttle Position Sensor
- Mass Air Flow Sensor
- Manifold Absolute Pressure Sensor
- Intake Manifold
- Throttle Body
P0068 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.