P0104
Mass or Volume Air Flow Circuit Intermittent
The ECU detects intermittent signal dropouts or noise on the mass air flow (MAF) sensor circuit. The fault is not constantly present, suggesting a loose connection, intermittent wiring break, or a failing sensor under specific conditions (vibration, temperature).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- MAF connector loose or corrodedCommon
- Wiring chafed against engine componentsPossible
- MAF sensor failing intermittentlyPossible
Parts involved
- Mass Air Flow Sensor
- MAF Connector
- MAF Wiring
P0104 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.