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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-23-2009, 06:36 PM   #1
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Default Evap prob P0442

So my car is still not getting great gas mileage like between 15-17 high way conditions. For the second time I got a P0442 which is slow leak in the Evap system. I have no vacumme hose leaks where else could it be leaking? what parts can I change or recharge. Write up will ensue.bs2
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Old 07-23-2009, 07:44 PM   #2
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According to some article I've read, a leak as small as .04" in diameter is enough to throw the code.

With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses
See this info for more links etc : OBD-II Trouble Code: P0442 Evaporative Emission Control System Leak Detected (small leak)
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