P0197 Code - Engine Oil Temperature Sensor Low

What Does P0197 Mean?

This code specifically means that the resistance value the powertrain control module (PCM) sees is low in comparison to the predefined specifications. This can possibly be due to high engine oil temperature.

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What are the common causes of P0197 ?

Typical causes of engine overheating are low engine coolant levels, faulty cooling fan/s, a blown or cracked cylinder head/s, a faulty radiator, or a faulty thermostat. This code could also be triggered by a faulty coolant temperature sensor, shorted or open electrical circuitry, or a bad PCM but the former scenarios rarely occur.



How do you troubleshoot P0197 ?

Now, clear the codes and test-drive the vehicle to see if the code is reset. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

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