P0521

[992dr]

P0521 Engine Oil Pressure Sensor / Switch Range / Performance popped up today, YAY

One thing I've noticed since we are starting to get some cold weather (in the last week) is my oil pressure will drop when accelerating even at low speeds but, once up to temp will be normal.
I typically let my car warm up until it idles down then go. Never saw it drop before, little concerning.
I do know the light came on because it was low while I was accelerating getting up to speed, once up to temp everything was fine. Actually, it seems like the pressure went up just a bit.
Any thoughts?

 

[OR VietVet]

Likely needs sender/sensor and screen replaced. Like this one but use Genuine GM parts: https://www.rockauto.com/en/moreinfo.php?pk=320055&cc=1433255&pt=4588&jsn=953&jsn=953

More Information for GM GENUINE 12677836

More Information for DORMAN 917143

Not a fan of Dorman but could not find GM/AC Delco screen

Take that back, I found it: https://www.rockauto.com/en/moreinfo.php?pk=7224492&jsn=1078

 

[992dr]

Sorry, I should've mentioned it in the original post.
I recently replaced my sender/sensor and screen.

Thanks for the links though, I'll be bookmarking them.

 

[OR VietVet]

Sorry, I should've mentioned it in the original post.
I recently replaced my sender/sensor and screen.

Thanks for the links though, I'll be bookmarking them.

Did you replace them with Genuine GM/AC Delco parts or the Dorman crap that causes problems for everyone? Oil Viscosity? Brand of oil? Why did you replace the sender/sensor and screen? To fix this problem? Did you use a mechanical gauge to get a true reading before the new parts install?

 

[992dr]

Did you replace them with Genuine GM/AC Delco parts or the Dorman crap that causes problems for everyone? Oil Viscosity? Brand of oil? Why did you replace the sender/sensor and screen? To fix this problem? Did you use a mechanical gauge to get a true reading before the new parts install?

Honestly, my mechanic replaced them. And I'm sure they used some random brand.

Mobil 1 Synthetic 5W-30. I lost all oil pressure but, it ran fine and I don't remember even getting a CEL.
Brought it to my mechanic and he diagnosed it and replaced everything and it resolved the problem.

Looks like I'm going to order some OE parts and replace them myself for piece of mind.

 

[OR VietVet]

Ok, but please check the actual pressure with a mechanical gauge while the sensor/sender is off. Do it while it is cold and watch and see what it does as it warms and when rev the engine. I am spoiled with mine. No screen and a cold start idles at 45-50 psi and after warm will idle at 38-40 psi. Will climb higher as I accelerate. Could not be happier. If yours makes no noise, then I would not worry about the engine as much as worry about getting the correct readings at the dash. That is why that mechanical gauge testing is so important. You can likely rent a gauge set at a parts store or buy an inexpensive one. Get a long enough hose attachment that you can bring the gauge out under the back of the hood and tape to w/s to watch while driving.

 

[992dr]

I appreciate the info. I'll try to find a gauge this weekend when I'm hunting for the parts though I have to be honest, not likely to find any OE parts local haha. So, I'll end up ordering everything from amazon or somewhere.
I get a little lifter tick every now and then but it doesn't last long. Mine will sit at the same 38/40 when warm but the pressure isn't high at cold start up. I'll have to pay more attention in the mornings, I usually run out to start it and run in haha.

Found this gauge https://www.amazon.com/ABN-Engine-P...t=&hvlocphy=9010167&hvtargid=pla-586461308155

 

[992dr]

Parts are the way but, damn shipping is ridiculous with the eta.
I'll be ordering the above gauge tonight, that'll be here Monday haha