Do you have a oart # for what needs to be replaced for PO496?
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2008 GMC Yukon Denali Question: What is engine code PO496. How do I fix it?
Answer #1csubak30 March 01, 2012, 16:40Master
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