Code PO521?

Hi,

The code you have is specific to the Engine Oil Pressure (EOP) sensor performance. There are a few things that can cause this to set. For example, a faulty oil pressure switch, PCM, a poor connection in connectors or wiring, and so on.

The first thing I would suggest is to first test or replace the oil pressure switch to see if it takes care of the problem. The problem with this is its location. It is at the rear of the engine, between the engine and the firewall. So, it is a little difficult to access. You will need to remove the intake manifold.

I attached the directions below. Note, there is a specially designed socket needed to remove this sensor. They are not too expensive, and oftentimes a parts store will lend one to you.

Let me know if this takes care of the issue.

Take care,

Joe

See pics below.