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Q: What is engine code PO496. How do I fix it?
on 2008 GMC Yukon Denali

Do you have a oart # for what needs to be replaced for PO496?
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It is most likely your evaporative purge solenoid has failed and needs replaced. Here's the procedure http://acdelcotechconnect.com/pdf/tsb/tsb_411822.pdf
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