I have been literally having one code after another....no joke.

First it was the battery, then a misfire (P0303 or w.e.), then I had the thermostat and temp sensor replaced....etc etc. All the lights are gone but one, the P0015 (2 of them)

Where exactly should I start with this? the car is running great, but I noticed the MPG has gone down a little bit but nothing that drives me crazy (like before with the other issues).

Any suggestions?

 

I'm guessing the Camshaft Reset Solenoid. Check this thread about 1/2 way down on page 2 for a description of the internals and how to clean it.

https://volvoforums.com/forum/volvo-...0-47208/page2/