P0520 OBD-II Trouble Code: Engine Oil Pressure Sensor/Switch Circuit Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0520 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0520 code

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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0520 DIAGNOSTIC Get a fair and transparent estimate upfront

diagnostic check engine light

P0520 definition

A P0520 trouble code is related to a vehicle’s engine oil pressure sensor or switch and its associated electrical circuit.

What the P0520 code means

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.

What causes the P0520 code?

The most common causes for a P0520 are:

  • Faulty oil pressure sensor/switch
  • Faulty oil pressure sensor/switch wiring
  • Faulty oil pressure from dirty engine oil
  • Faulty oil pressure from a lack of compression

What are the symptoms of the P0520 code?

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.

How does a mechanic diagnose the P0520 code?

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.

Common mistakes when diagnosing the P0520 code

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.

How serious is the P0520 code?

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.

What repairs can fix the P0520 code?

The most common repairs for a P0520 are as follows:

Additional comments for consideration regarding the P0520 code

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.

Need help with a P0520 code?

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 1-800-701-6230.

trouble codes
OBD-II
P0520

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0520 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,788

Rating Summary
3,460
163
43
24
98
3,460
163
43
24
98

Jerimiah

16 years of experience
207 reviews
Jerimiah
16 years of experience
great exsperiance
2003 MITSUBISHI GALANT - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Joseph

15 years of experience
115 reviews
Joseph
15 years of experience
He was very professional! He explained to me everything that was going on with my car in laymans term and gave me good reccomendations for things to look out for. And he topped of my transmission fluid and brake fluid out of the kindness of his heart! Much appreciated.
2009 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON - TOWSON, MARYLAND

Alexis

27 years of experience
74 reviews
Alexis
27 years of experience
Good
2005 KIA SPORTAGE - CHECK ENGINE LIGHT IS ON - MIAMI, FLORIDA

Noni

19 years of experience
10 reviews
Noni
19 years of experience
good
2007 CHEVROLET EXPRESS 3500 - CHECK ENGINE LIGHT IS ON INSPECTION - FLUSHING, NEW YORK

More related articles

How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: Trouble code P2015. I don't know how to fix it.

The intake manifold runner control is a system that controls amount of air entering the engine, by way of valves in each intake manifold runner. They are linked together as 4 per side, bank 1 and bank 2. The control...

Q: What would cause brand new O2 sensors to give codes 172, 173, 176, and 177, rich and lean conditions, both sides at the same time?

When it comes to across-the-board codes being set such as this, it is usually a result of something "upstream" creating the condition to set all these codes. For instance, it is rare for both O2 sensors to fail at exactly...

Q: Bad oil pressure sensor

A common failure in your vehicle is the oil pressure sending unit. Once the sensor is replaced, these codes should go away. I would ask for help from one of the mechanics at YourMechanic to replace your oil pressure sensor...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com