Just replaced oil pressure sensor on my 06 Charger RT 3 days ago with an after market after getting the PO520 code for low oil pressure switch defect. Still had the check engine light until I put in a new mopar sensor. Just wanted to let anybody about to swap the sensor know to use the ORIGINAL Mopar sensor from the dealer. I don't know why but aftermarket sensors don't register. It was a pain to swap it, alternator has to come out as well. Just wanted to let everyone know before putting the work in.

 

I'm just starting to have this problem on the same exact vehicle. Did you do a code reset, or are the aftermarket units just that crappy?

 

Hey bud,
Originally when I got the PO520 code I swapped the sensor for an aftermarket. After reconnecting the battery the check engine came back. Only this time it was code PO522 Oil pressure switch low voltage. I waited two days to see if the light would go away but it didn't, even tried resetting it. I went to the dealer and bought the original oil pressure sensor and put it in. The check engine light turned off without resetting a thing, and stayed off. The price for an aftermarket sensor is $50 and at the dealer it came out to $76. Hope this helps.