Question about 2004 Pontiac Aztek
Usually that's a large leak in the Evaporative Emission System. That's the system that prevents the escape of fuel vapors from the fuel system.
You can get this from a loose gas cap, a non-oem gas cap that doesn't fit right, or from a major leak in the EE system somewhere.
So start off by removing and re-installing the gas cap and then drive for a day and see if the codes come back. If that doesn't work, see if you can swap the gas cap with one that you know is good and then try that for a day. If that doesn't work someone will need to go through the tubing of the EES looking for something damaged, loose, or pulled off.
Posted on Apr 08, 2015
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Posted on Jan 02, 2017
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