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Sorry buddy I can't answer that i'm not a mechanic.

I am not sure what the part number is four Dorman. But it was the encoder motor it is not hard to install

Thanks for replying Donut. My check engine light came on about a year ago. But when I got it checked out it was one of four O2 sensors. I never pinpointed which one so the light is still on. I guess I'll go today and see if there are anymore new codes . How do I check the actuator ? And what is...

NEED Advice ! I have a 2007 Tahoe LTZ that I bought new in 2006. I don't drive it much so it has 68,000 miles. The other day I went leave, it was snowing out and my four wheel drive was not working. When turn the selector to Auto the light stays in 2wheel drive. If I turn the selector to 4wheel...