My 2004 350z which has 94k miles is stuck at 120psi on startup and while driving. I’m not sure if it’s just a faulty sensor because it happened after flooring it - sort of after a 8-10 minute warmup.

Some context, I was waiting for my car to warm up and I waited a good 8-10 minutes while I was talking with some friends. One of my friends wanted to test drive it, and I was checking the rpm and oil pressure gauge while it was warming up too so before I took it I remembered that the rpm were at around 650 and oil pressure around 30. (I’ve added oil stabilizer so my oil is normally a little higher) Anyways, he took one quick lap around the parking lot (20 seconds) and then 80% throttled it on the straight of the parking lot for around 5 seconds. Right after that, I check the car and see that the oil pressure has maxed out and turn it off immediately. I keep starting the car and checking if it goes back to normal but every time I start it up it stays stuck at 120. I don’t notice anything different, but if I open the oil cap and look I see some faint smoke or white gas come out. (I don’t know if this is relevant to the pressure but I was able to loosen the cap with my hands normally). I let it run for some time and I couldn’t see anything else looking wrong and I drove back home 10 minutes very slowly around 20mph barely accelerating. I didn’t want to drive it but I couldn’t leave it where it was and couldn’t get it towed. After driving I noticed at idle it was around 110 or 115 now.

Sorry for the long message I just don’t know what’s wrong, could anyone help me out and know if I can drive it to a mechanic or if I need to tow it?

 

It could be a bad/faulty oil pressure sensor. If I were you, first, I would check the oil level using the dipstick. It is best to do this when it has sat for a while on a level surface. If you check it after it has warmed up or after driving, you may get inconsistent results. If you verify the oil level is good, you can manually check the oil pressure using a mechanical oil pressure gauge or oil pressure testing kit. Below is the procedure from the FSM:


If the mechanical oil pressure test checks out in the normal reference ranges listed above and you're getting different readings than the oil psi gauge in the car, then the sensor is the problem. If you don't feel comfortable replacing it yourself, I imagine you're safe driving it to a mechanic to get fixed.

 

Swap the sensor, it’s really cheap