P0102
Mass or Volume Air Flow Circuit Low Input
The MAF sensor reports an air flow value below the plausible minimum for current engine speed and load. The ECU substitutes a calculated load value while the fault is active.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- MAF sensor failedCommon
- MAF connector loose or disconnectedPossible
- Signal wire shorted to groundLess likely
Parts involved
- Mass Air Flow Sensor
- Intake Duct
P0102 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.