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04 Z71 Avalanche P0449 and P0455

dmoravcik

New Member
Joined
Oct 22, 2018
Messages
1
Location
Raleigh,NC
My 04 Z71 has 124,000 miles and it has thrown these 2 codes. Also, received the Tighten Fuel cap message. I replaced the fuel cap and that did not fix the issue. Any advice as to what is the typical issue or where to begin?
 
Not sure you will get a reply from original poster, he only posted once and was last active 12-01-18 per his profile.....
 
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