P0198: Engine Oil Temperature Sensor High
Can you still drive? Yes, but without accurate oil temperature data the engine management system may not optimize cooling properly. Monitor for overheating.
What Does P0198 Mean?
Code P0198 means the engine oil temperature sensor is reporting an abnormally high voltage, which corresponds to an unrealistically low oil temperature reading. This typically points to an open circuit, a disconnected sensor, or a wiring fault rather than an actual oil temperature problem.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Open circuit in the oil temperature sensor wiring
- Disconnected sensor connector
- Failed oil temperature sensor
- Corroded wiring causing intermittent open circuit
Symptoms
- Check engine light on
- Oil temperature gauge reading incorrectly low
- Possible cooling fan issues
- Variable valve timing may not function properly
Diagnostic Steps
- 1Read freeze frame data and check reported oil temperature
- 2Inspect the sensor connector to confirm it is plugged in
- 3Test for an open circuit in the wiring harness
- 4Measure sensor resistance and compare to manufacturer specs
- 5Replace the sensor or repair wiring as indicated
Recommended Parts & Tools
engine oil temperature sensor
automotive multimeter
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $75 - $250 |
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Chat with AI About P0198Commonly Affected Vehicles
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Frequently Asked Questions
Does P0198 mean my oil is too hot?
No, the high input refers to high voltage, which actually means the sensor is reading an unrealistically low temperature. It is an electrical fault, not an overheating condition.
Is P0198 common on European cars?
Yes, European vehicles like BMW, Audi, and Mercedes frequently use oil temperature sensors and this code is relatively common on those platforms.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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