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P0520 is a diagnostic trouble code (DTC) for "Engine Oil Pressure Sensor/Switch Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0520 trouble code is related to a vehicle’s engine oil pressure sensor or switch and its associated electrical circuit.
P0520 is a OBD-II generic code for threshold issue with the oil pressure sensor. If the engine computer reads a signal from the sensor that is either too high or too low in relation to the manufacturer’s parameters, a P0520 will be triggered. If a red oil pressure light is associated, there could be a serious mechanical problem as well.
The most common causes for a P0520 are:
Symptoms will vary from nothing more than a check engine light and inoperable oil pressure gauge (if equipped), to rough idling, poor engine performance, excessive engine noise, and even premature engine failure.
With any oil pressure issue, your mechanic will first visually inspect the engine’s oil and levels. If it’s obvious the oil has surpassed its change interval, it should be changed with a new filter. A visual inspection of the pressure sensor will come next to ensure it is properly seated and the wiring is not damaged. The sensor can be tested using a digital multi-meter before being replaced.
Not all P0520s are caused by faulty pressure sensors as poor engine maintenance can result in poor oil pressure. It’s important to check for other mechanical failures before replacing parts.
A P0520 can be very serious if the oil pressure is indeed too low or too high. Low oil pressure for example can cause the crankshaft and connecting rod bearings to seize, reducing an engine to a glorified paper weight.
The most common repairs for a P0520 are as follows:
If you encounter a P0525 with a red, oil light, it’s imperative that you stop the vehicle as quickly and as safely as possible before any catastrophic engine damage results.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.