Originally Posted by
Tim the Teacher
With a p0455, 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, and/or
inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
They did a leak test and no indications noticed. I am going to replace the cap and watch it from there. The tech said the smell of gas could have been left over in the cat from the bad 02 sensor last month.