Drive with caution — fix soon.
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.
$110 – $320
Varies by vehicle and root cause.
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.
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.
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.
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.