P0197 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0197 – Engine Oil Temperature Sensor Low

 

P0197 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P0197 Possible Causes

 

Faulty Engine Oil Temperature sensor,Engine Oil Temperature sensor harness is open or shorted,Engine Oil Temperature sensor circuit poor electrical connection

 

P0197 Description

 

The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.