P0197 Fault Code

Engine Oil Temperature Sensor Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0197 error code indicates that the Engine Oil Temperature Sensor is reporting a lower temperature than expected. This could be due to various reasons such as a faulty sensor, wiring issues, or problems with the engine's oil flow.

• The engine oil temperature sensor plays a crucial role in engine performance and longevity.
• It helps the engine control module (ECM) determine the optimal temperature for the oil, affecting lubrication and thermal management.
• An incorrect reading can lead to poor engine performance and can cause further issues if not addressed promptly.

What are the symptoms of the P0197 code?

When the P0197 code is triggered, you may experience:

• Poor engine performance and reduced fuel efficiency.
• Unusual engine behavior under load, including hesitation and stalling.
• Dashboard warning lights, specifically the check engine light.
• Possible overheating of engine components if not addressed properly.
• In some cases, you may also notice extended engine warm-up times.

What causes the P0197 code?

There are several potential causes for the P0197 code:

• A faulty engine oil temperature sensor that is unable to provide accurate readings.
• Damaged wiring or connectors leading to improper signal transmission.
• An oil temperature that is genuinely low due to engine issues, such as running too cool from a stuck thermostat.
• Faulty engine control module (ECM) that misinterprets sensor data.

How to fix P0197?

To resolve the P0197 fault code, follow these recommended steps:

• Inspect and test the engine oil temperature sensor for proper operation and replace if faulty.
• Check the wiring and connectors for any damage or corrosion that may be impairing signal transmission.
• Examine the engine cooling system, including the thermostat and oil cooler for proper function and replace any faulty components.
• Clear the fault codes and take the car for a test drive to see if the code returns; further diagnostics may be required if issues persist.