ANSWERS: 1
  • 157: Possible causes: -- Poor continuity in MAF sensor harness or connectors. -- Intermittent open or short in MAF sensor or harness. -- Damaged MAF sensor. -- Idle Air Control (IAC) system failure (at closed throttle position). 172: lean means not enough fuel in the mix. Fix the MAF, replace the PCV valve and see if you still get the code. 452: Either your PCM or speed sensor are damaged. You'll need a breakout box and bunch of other stuff only a dealer would have to test that. Easier is to find both at a junkyard and replace.

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