P0197 — Engine Oil Temperature Sensor Range/Performance
Drive with caution — fix soon.
What P0197 means
This code means the engine oil temperature sensor is reporting values that don't match expected behavior or other engine readings, often because the sensor is aging or drifting. Common fixes include replacing the sensor or repairing its wiring, and checking the oil level and type. It's usually a manageable, low-cost repair.
Common symptoms
- Check engine light is on
- Harsh or inconsistent shifting
- Oil temperature reading that seems inaccurate
- Slight loss of fuel efficiency
- Occasional hesitation or rough running
Common causes
- Failing engine oil temperature sensor
- Sensor calibration drifting with age
- Corroded or damaged sensor connector
- Wiring resistance or chafing in the harness
- Incorrect oil level or viscosity
Typical repair cost
$110 – $320
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0197 code?
Usually yes, since the engine often runs normally. Still, the unreliable oil temperature reading can affect shifting and engine protection, so get it diagnosed before it leads to bigger issues.
How much does it cost to fix a P0197 code?
Expect roughly $110 to $320. Replacing the oil temperature sensor is the typical repair, with the final price depending on parts and how accessible the sensor is.
Is a P0197 code serious?
It's moderate. Your car will usually still drive, but a sensor reading out of range can compromise how the computer protects the engine, so it deserves timely attention.
What's the difference between P0197 and P0198?
P0197 means the sensor reads too low or out of range, while P0198 specifically means the signal is low (often a short to ground or a failed sensor). Both involve the same oil temperature sensor circuit.