Question about 1999 Chevrolet Lumina

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1999 chev. lumina emissions test (trouble codes p0442 & p0446 )

What can i do to fix,

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Replace gas cap but first check for rust around rim of filler tube where gas cap makes contact with tube. if there is rust clean it off and replace the cap.then you need to clear the code in the computer to see if this was the problem.. corrosion on the filler tube will cause a small lesk in the evaporative system which corresponds to the 442 code

Posted on May 25, 2009

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Error codes P0442 & P0446 Likely fixes?


A code P0442 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
Possible Solutions 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

A code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Since you are getting both of these codes the most likely problem will be a faulty Vent Valve.

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Jan 15, 2012 | 2002 Lexus ES 300

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Have OBD codes P2A00, P0441, P0442, P0446 on my 2003 Highlander. Selling the car in a few months. Does this really need to be repaired before trade-in? Can I just erase the codes?


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Po442 code 1999 chevy lumina car 3.1 engine


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1 Answer

Trouble Code P0442


Hi:
This code is an Evaporative emission leak code. it is often caused by a loose or worn out gas cap.
To fix, try this:

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

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3 Answers

I am blowing error codes P0442 and P0456, can i fix it myself


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