i had the same codes for like six months on and off all the time. It was the tune in my case. I went through two maf sensors thinking they were bad but it wasn't the sensors. It was the tune. Not naming names so dont ask. It wasn't your guy though. I got flashed back to stock, got a full refund, and then had it tuned by tuning technologies with a set of cosworth cams and it hauls ass now without one single code ever since. Talk to your tuner .
AMS-ETS-FP-WORKS-ADVAN-NITTO-KWV3-ROBISPEC-RALLIART-VPM1-ULTIMATE RACING-SYNAPSE-SAMCO-COSWORTH. E85 502 AWHP\
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91 PUMP 400 AWHP