Engine code P0056

21249 Views 11 Replies 5 Participants Last post by BurbanMan, Nov 14, 2013

Discussion Starter · Apr 5, 2011

I hooked up the programmer today to change a few things and it showed up with a engine code PO056 anyone know what the code means.

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chevynewb4 said:
Where on the truck is that sensor for me to change it myself?

O2 sensors are on the exhaust pipe, before and after the cat converter.

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