it will run fine, if after 3 succuesful ignition cycles, moreover 3 successful runs/drives without incedent, the light goes off, it was a glitch. it will run just fine. the fuel rail pressure code usually pops up with plug-ins, and the air temp sensor code likes to pop up after installing a cold air intake. so be prepared for the questions when you hit the dealer if you havent installed any performance parts. they usually ask.