I’ve had P2A00 and P2A03 for a couple months now. Coincidentally It was right after I got re tuned. I believe I am getting 10-11mpg and reduced performance. At first I had P1148 and my air fuel ratio passenger side was reading 9.8. I replaced the passenger side header sensor and both were reading at 14.7. PA200 and P2A03 are still on and I am getting terrible mileage.