Honda CR-V P0520: Oil Pressure Switch/Sensor → Circuit

Common OBD2 trouble codes include P0520.  It’s generic, which means that it has the same meaning for the Honda CR-V as it would any other vehicle.  P0520 indicates that the oil pressure sensor is operating outside of its normal “range”.  It's usually due to a problem with the wiring or an oil pressure sensor switch.

Your CR-V’s oil pressure sensor measures the oil pressure mechanically, and converts that reading into a voltage signal that the ECM (Computer) converts into an oil pressure reading.  This signal triggers an oil warning light.

A serious problem could arise if the red oil warning lamp is lit.  Don't assume the oil pressure sensor has failed.  If there's no oil pressure, then P0520 could occur.

The P0520 Quick Facts

• Most common is an oil pressure sensor.
• Low oil pressure can cause it.
• If you hear knocking or have the low oil pressure light, don’t drive until P0520 is diagnosed.
• Similar to P0521.

P0520 Symptoms:  Honda CR-V

Of course, there are no obvious symptoms (apart from the check engine light).  You may have low oil pressure if your engine makes unusual sounds (clacky or metallic). 

P0520 Causes:  Honda CR-V

• Oil Pressure Sensor Although the P0520 problem is most likely caused by the oil pressure sensor, it would still be wise to first check the oil quality and oil level, along with the wiring.
• Oil Pressure Sensor Wiring - If P0520 is displayed, it means that the oil pressure sensor signal has gone through a circuit problem.  It could be a problem with the wiring.
• You can have low or no oil The first thing that you should do is check to see if there is oil in your vehicle’s engine at all.  It can also throw the P0520 code if it is low or empty.  Clear the code and fill up the oil.  
• Low Oil Pressure The code will appear if oil pressure drops too low.  This code should be visible with an oil light or low readings from the oil pressure gauge. 
• Wrong or dirty oil- If your CR-V’s oil hasn’t been changed for a long enough period of time, it can interfere with the oil pressure sensor, even if there still is oil pressure.

CR-V P0520 Diagnosis

These are the steps a mechanic will take to diagnose manually P0520 on your Honda CR-V.  

1. Take a look at the Oil

Check the oil level first.  If it’s full make sure that it looks healthy.  The oil pressure sensor may be affected if the oil appears blackened or gritty.  If the vehicle is past it’s oil change deadline (regardless of how the oil looks), changing the oil would be a good idea.

2. Check the Wiring Harness

Next, you should inspect the wiring harness running from the oil pressure sensor to the ECM.  You could have P0520 if the wiring is damaged.  Don’t forget to make sure that the harness is still plugged into the sending unit and undamaged.  

One of the most common reasons this code is thrown is because wiring problems are common.  The wiring is close to the CR-V’s exhaust and can get brittle over time.

3. You can manually check the oil pressure

If the wiring and oil levels are in good condition, you can manually test the oil pressure.  There are two options: Manual oil pressure gauge to see if it’s where it needs to be.  They're easy to use.  Here’s a Great YouTube Video This will demonstrate how you can use the gauge to test.

If the oil pressure from the gauge reads ok, you’ll need to replace the oil pressure sending unit/sensor.  If there is low or no oil pressure, you’ll need to figure out why.

Conclusion:  P0520 Honda CR-V

The process of diagnosing P0520 can be done easily.  Check that the oil pressure has been checked if it is lit.  You will have a great time fixing your CRV.