U0300 2005 v6 Mustang

[julienperformance]

Hi , I have a problem with a 05 V6 Mustang , This customer installed a 91 oct Airaid tune in is car , since then the car has no performance , also I have this code , PO171 P01714 , P0316 and U0300 , this car has no cat so the 2 first one are cause by this , has for the others if I'm returning the car to stock they are not there anymore , and no fail safe on the cluster , the customer sent you his predator and computer car this winter to solve this problem . What do you suggest ?

Thanks

[mikel]

he lean codes are from the CAI, not the cats, adjust the MAF curve for the CAI if there is no Airaid tune in the tool.

U0300 indicates an issue in the car somewhere, not generally tune related at all...

[julienperformance]

I think you are rigth , I just reinstalled the original backup and the U0300 is still there , I will try to find the problem on that car .

Thanks

[mikel]

check O2 sensors, O2 wiring, plugs/coils, etc.