Ladies and Gentleman,
2013 Suburban with 84k miles on it, recently it through a CEL related to the infamous P0521, low oil pressure code. The sensor was replaced, code reset, and all was well for about a week. CEL again came on related to the same code, P0521. This time I replaced the filter screen below the oil pressure sensor, reused sensor since it was less than a week old, reset code, and all was well for about two weeks, now the CEL has again came on with the same code.
Am I missing something? The Truck runs great, oil was recently changed with a new filter as well (Amsoil Synthetic), it doesn’t burn oil. The P0521 code is one of those “permanent” codes that stays in the ECM until a certain driving procedure is followed, I found that out when clearing the codes both times previously. I was able to delete the temporary codes but not the permanent one. Could the sensor be bad when the code was thrown the second time? Is there a specific brand sensor that people are buying with success?
Could there just be some sludge in the motor and I need to buy something like a 5 pack of oil filters and oil pressure filter screens and just change them more frequently a few times? With this last oil change I did add some Stiction Eliminator from HotShots Secret which has worked well for me in previous vehicles. This truck is new to me so I thought the application of this additive would help clean up the internals and give me a good baseline.
