P0199
Engine Oil Temperature Sensor Intermittent
The ECU detects intermittent dropouts on the engine oil temperature sensor circuit. Loose connector, chafed wiring or sensor failing thermally.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Connector looseCommon
- Wiring chafedPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Engine Oil Temperature Sensor
- Sensor Connector
P0199 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.