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I had a problem with the HPFP and so I recently went back to stock. Stock catted header, stock tune. The dealership wouldn't do anything if I was modified, and I need the car to be dependable. They cleared the codes for the HPFP (I wish I had written them down) and they have not come back. But I also think they did nothing but drive it 50 miles.
I got the car back from the muffler shop 2 days ago and I haven't put 50 miles on it yet. I got p0420, P119F and P219A. The bad fuel mileage makes me think AF or O2 sensor or wiring. What else could it be? Fuel mileage, mostly city, low 20's
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