So I took the 08 in to have the turbo replaced under warranty at 72,000 miles. The morning I took it in it threw a p0101 code, maf sensor. so I asked my buddy to look at it while it was there. After replacing the turbo they change the MAF sensor. The light came back on and the tech can't figure it out. It has a factory delco filter and I did the ppe air box mod. The air box has been moded for over 2 years with no light. other than that it is stock. any Ideas?