I have a 2006 S60 2.5T with 40k miles. My check engine light went on and stayed on for two drives. Then turned off and hasn’t returned for next couple of drives. Error code says fuel pressure regulator. Should I bother to bring it to a mechanic or since the light went off (didn’t burn out – it momentarily turns on when I start the car) should I assume all is well?
I’d bet you have a faulty fuel rail pressure sensor, kind of a common problem.
If the light remains off then drive on without worry. Any system can have a hiccup so maybe yours did. If the light comes back on get the codes again to make sure its the same one. Then have someone look at it.