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.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Engine oil temperature sensor
- Sensor connector
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Connector loose
- Wiring chafed
- Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.