What is P0197 : Engine Error Code Causes Explained
Is your check engine light on showing the P0197 code? Don’t panic! This code refers to the Engine Oil Temperature Sensor Low Input. It means the engine control module (ECM) is receiving a signal from the oil temperature sensor that is too low, which indicates a weak or incorrect voltage reading.
📘 In this video, you’ll learn:
✅ What P0197 means — the engine oil temperature sensor, which monitors oil heat levels for proper lubrication and performance, is sending a signal that’s lower than expected.
✅ Common causes include:
Faulty engine oil temperature sensor
Short to ground in the wiring or connectors
Damaged or corroded sensor circuit connections
Low or contaminated engine oil
Faulty engine control module (rare)
✅ Vehicle symptoms may include:
Check engine light on
Poor fuel efficiency
Rough engine performance
Hard starting, especially in extreme temperatures
Possible overheating issues if not addressed
🎯 This code is especially common in vehicles where the ECM depends on accurate oil temperature readings for fuel mixture and timing adjustments.
👉 Always check the wiring, sensor, and oil condition before replacing parts to avoid unnecessary repairs.
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