The check engine light was on, so could not smog. I took it in to have it fixed and the truck read the following codes. P0446, P0463, P01637, P1638 The mechanic "checked the alternator" reporting it was ok. He did circuit tests for fuel senser and EVAP. He then replaced the fuel modual, cleared codes and reported they did not come back. Shortly after that the service engine light came on again and when scanned said P1637 & P1638 again. He said to bring it to a different place and have alternator checked by someone who could do a more thorough job. Had it checked and it was ok so cleared codes and comepletsolstice cycle. Now the truck will not cimete the EVAP or the secondary air system cycles!!! HELP!!
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