An Oil Pressure Temperature Sensor (OPT) is a dual-function sensor that monitors both oil pressure and oil temperature within the engine’s lubrication system. This data is sent to the vehicle’s ECU (Engine Control Unit) or PCM (Powertrain Control Module) to ensure the engine operates safely and efficiently.
By continuously monitoring these two critical parameters, the sensor helps protect the engine from low oil pressure, overheating, or lubrication failure — all of which can cause severe internal damage if left unchecked.
How It Works:
- The pressure element measures the hydraulic force of the oil circulating through the engine and converts it into an electrical signal.
- The temperature element monitors oil temperature changes using a thermistor that varies voltage with heat.
- The ECU uses both readings to:
- Regulate engine protection systems.
- Trigger warning lights or adjust performance settings when necessary.
- Ensure the correct oil viscosity range for optimal lubrication.
- Together, these signals help maintain safe oil flow, pressure balance, and engine performance.
Product Features & Benefits from Walker Products:
- Exact OE Fit: Direct-fit replacement ensures proper system function and easy installation.
- OE Replacement Quality: Designed and manufactured to meet or exceed OE standards for performance and reliability.
- Durable Construction: Engineered to resist oil exposure, vibration, and high temperatures for long-term durability.
- Enhanced Engine Protection: Provides accurate pressure and temperature data to help prevent engine wear and failure.
- Aftermarket Expertise: Supported by over 75 years of experience in precision engine management solutions.
Symptoms of a Failing Oil Pressure Temperature Sensor:
- Inaccurate oil readings (temperature or pressure displayed incorrectly).
- Oil warning light or temperature warning indicator illuminated.
- Erratic or fluctuating gauge readings.
- Engine overheating or reduced performance under load.
- Possible Check Engine Light (CEL) activation.
Common Check Engine Light (CEL) / OBD-II Codes
Since 1996, OBD-II systems have been used to monitor emissions and engine health across all vehicle platforms. The following codes are commonly linked to Oil Pressure Temperature Sensors and should be used as a general guide only.
Walker Products will not be responsible for any use of this information. Always consult a qualified mechanic and follow manufacturer and EPA guidelines for diagnosis, replacement, and ECU/PCM relearn procedures.
- P0520 – Engine Oil Pressure Sensor/Switch Circuit
- P0521 – Engine Oil Pressure Sensor/Switch Range/Performance
- P0522 – Engine Oil Pressure Sensor/Switch Low
- P0523 – Engine Oil Pressure Sensor/Switch High
- P0524 – Engine Oil Pressure Too Low
- P0526 – Engine Oil Temperature Sensor Circuit
- P0527 – Engine Oil Temperature Sensor Circuit Range/Performance
- P0528 – Engine Oil Temperature Sensor Circuit Low
- P0529 – Engine Oil Temperature Sensor Circuit High
- P0530 – Engine Oil Temperature Sensor Intermittent