P0520 Code - Engine Oil Pressure Sensor/Switch Circuit Malfunction

What Does P0520 Mean?

OBD-II Code Oil pressure warning light illuminated is defined as a Engine Oil Pressure Sensor/Switch Circuit

The Engine Oil Pressure Sensor tells the engine control module (PCM) the engine oil pressure. When the PCM detects an incorrect signal from this sensor it will set code P0520.The low oil warning light on the instrument cluster may also illuminated.

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What are the common causes of P0520 ?

• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Faulty IMRC actuator relay (if equipped)
• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

How do you troubleshoot P0520 ?

The most common repairs for a P0520 are as follows:

• Replacing the oil pressure sensor
• Repairing the oil pressure sensor wiring
• Changing the engine oil and filter

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