Code p0442 on 2002 Pontiac Grand Prix

This code came up today in a scan. So far, gas cap looks ok and have found no visible hose leaks. What else should I do?

by in Danville, IL on August 13, 2013
1 answer
ANSWER by on August 13, 2013
You can take it to a shop and ask for a "smoke test". This will usually locate the leaks location.
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