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SES light


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elkhunter
08-01-2007, 10:34 AM
Hey all got these 5 codes on my truck.

99 GMC Sierra 4.8l NBS. 154K miles

P0171 & P0174 ??

P0420 & P0430(think bad cat on each side?)

P1870??

thanks in any advance for any help!!
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