P0520 Code Engine Oil Pressure Sensor/Switch Circuit Malfunction

[Big K]

I am still getting this code on my 2005 300C.

I thought maybe the last person that change my oil used 5W-30 oil (which I was getting p1521 code also then, but have since cleared the codes and that one isn't back yet)

What do I need to do to fix this?

Where is this sensor on the engine? Easy to change? Any part #'s for it?

Also, I found this one on Autozone's website. Is this the same part?

AutoZone.com | Shopping | Parts | Product Detail - Oil Pressure Switch

I gotta get this fixed since it won't pass inspections since it keeps throwing the MIL light.

Thanks!

[bruno]

Here is a recent post by one of our forum experts, fnkychkn, posted
here.

bruno

[Rambit]

Thanks bruno. I was just about to paste the same thing from the service manual as what was in your link for possible causes. Interesting, in the manual they suggest a direct correalation to ensuring the correct oil viscosity has been used. The OP mentioned a previous error in that.

I think I'll just post the pages of the service manual as it applies to this code in a few minutes.

Bernie

[Big K]

Thanks guys.

Any help is greatly appreciated!

Part # would be great also

[Rambit]

Originally Posted by Big K

Thanks guys.

Any help is greatly appreciated!

Part # would be great also

Here's the pages relating to that code. I'll have a look in the parts manual for the number & location. I have to be honest not much of this makes much sense to me, but for what it's worth...

Bernie

[Rambit]

I believe #7 is the sensor you're looking for.

Bernie

[bruno]

Wow Rambit! That information is very detailed and impressive. Thanks for helping out another forum member!

bruno

[Big K]

Sweet! Thanks!

I found something else also from a SuperCharger Install!

[Big K]

I got it changed today (in the freezing rain no less )

It wasn't too bad but the alternator bolts are a PITA. I am guessing they haven't been off since the factory and they ain't easy to get to either.

There is 1 you can see up top, and 2 under the alternator, all 15MM size.

But once those are broke lose and off, just swing the alternator out of the way(with belt off of course) and use a 1 1/16" Socket for the Oil Pressure Sending Unit.

After that, it is easy, it all goes on like it came off

[Rambit]

So, did it fix the problem?

Bernie