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just bought a 2005 tahoe and the fuel gauge be tripping when i put over $20 in gas. it reads fine as long as i don;t go over $20. if i do go over the gauge goes pass the full section sometimes it goes all the way down vertical. anybody know what could be the issue. the guage goes the the E once...

no codes are coming up not even check engine light. when i looked up the emissions test on my friends scan tool it showed evaporative, EGR, and oxygen sensor incomplete

went to get my inspection sticker and evap was incomplete. went home and borrowed my neighbors scan tool and no codes came up but showed 4 incomplete problems. Evap, EGR, oxygen sensor, and forgot the other one. don't understand why my check engine light and codes never came on if it involves...