2003 Volvo S40 1.9T codes P0455 and P0299


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So after picking my car up from the shop I had taken it on a small drive and came back home. The car had CELs before and after I got it (and only some of the CELs I took it in for) so I didn't think anything of it.

After I got back I ran the scanner on it to see if maybe the codes were still there/had changed. 

I went from codes P0420(catalyst system under threshold), P0456(P0455 but minor leak), and P0015(timing Retarded on exhaust cam) to these new ones. 

I had my coolant system flushed and filled after a t fitting blew off(and subsequently the turbo sucked in some coolant but not enough to damage it I don't think) and I had my pcv valve system replaced. 

Some small things. The turbo, while being Underboost, still makes boost, so I know the wastegate can't be at fault. Also my mpg are terrible. I'm talking 13-17mpg on a car that should get 30mpg~

Any help and/or advice would be greatly appreciated! 

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P0015 is likely the source of your poor fuel mileage and performance. P0420 won't really affect how the car runs unless the cat substrate is broken and clogging the exhaust.

Lets start with the obvious, do you have the correct amount of oil in the engine? Did you have any work done to the timing belt area?

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