The P0197: Engine Oil Temperature Sensor Low indicates that there is an issue within the engine oil temperature sensor circuit, typically showing that the sensor is reporting lower than expected readings. This problem could stem from a low voltage condition in the circuit, a faulty sensor, issues with the wiring or connectors, or even a malfunctioning Powertrain Control Module (PCM). In simpler terms, this code suggests that your vehicle’s system is detecting that the engine oil temperature is abnormally low, which could lead to poor engine performance or damage if not addressed.
P0197 – Quick Overview
| Meaning | P0197: Engine Oil Temperature Sensor Low |
| Is it serious? | Yes, this code is serious as it can cause incorrect oil temperature readings, leading to engine damage. |
| Possible causes | – Low voltage in the engine oil temperature sensor circuit – Faulty engine oil temperature sensor – Wiring or connector issues – Faulty PCM |
| How to diagnose? | – Measure the voltage in the engine oil temperature sensor circuit. – Inspect the sensor for proper operation. – Check wiring and connectors for defects. – Replace or repair any faulty components. |
P0197 Meaning
The P0197: Engine Oil Temperature Sensor Low means that your car’s system has detected a problem with the engine oil temperature sensor, which is reporting an unusually low temperature. This could be due to an issue with the sensor itself, a problem with the wiring, or a malfunction in the car’s computer. If this issue isn’t fixed, it could cause the engine to perform poorly or even lead to damage over time.
Step-by-step diagnostic guide
Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
| Inspect the Engine Oil Temperature Sensor | Visually inspect the engine oil temperature sensor for any signs of damage, corrosion, or disconnection. Ensure it is securely attached. | Flashlight, Safety Gloves |
| Test the Engine Oil Temperature Sensor | Using a multimeter, test the sensor for proper resistance and operation. Compare the readings to the manufacturer’s specifications. | Multimeter, Manufacturer’s Specifications |
| Inspect Wiring and Connectors | Carefully check the wiring and connectors leading to the engine oil temperature sensor for any signs of wear, corrosion, or breaks. Look for loose or disconnected wires. | Flashlight, Multimeter |
| Repair or Replace Damaged Wiring/Connectors | If any wiring or connectors are damaged or corroded, repair or replace them. Ensure connections are secure and free from dirt or corrosion. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM and its connections for any signs of damage or loose connections. If the PCM is suspected to be faulty, it may need reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After completing the necessary repairs, clear the P0197 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0197 code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko