Hello. I have a 2007 Chevy Tahoe LT 5.3V8 flex fuel. My engine oil gage pressure normally runs 40. My gage went to 80 and stayed there for a couple hours then when I started it the next morning it stayed on 0. Engine is running fine other than that. I haven't had any recent oil change but it is due for one. Any thoughts on what could be causing it? Thank you

 

Years ago my son had a 08 Tahoe and was having similar problem. I changed the oil pressure sensor and cleaned the wire mesh screen below the sensor. which cured the problem.
Shop wanted $400 to do it claiming intake manifold must be removed. Should be at left rear of engine.All u need is a large socket(can't remember size) and small hands and it is possible without manifold removal. Best of luck to you.

 

27mm deep socket.

I think this thread of mine will help, especially Post #2 https://chevroletforum.com/forum/tahoe-suburban-25/2014-yukon-denali-6-2-oil-pressure-issue-115193/

And look at Post #6 there too. I saw one video (today) where someone used nippers to cut away some of the little plastic shield (that apparently does nothing but block access) to make access to the sender significantly easier.

My only "contribution" and tip to ease this R&R for others in the future is I tied a 2-foot twine/string around the new sender so I could retrieve it if I dropped it in the process of getting it to thread in. After threading in, I pulled on the twine to break it.

 

Thank you so much for all the helpful insight I am fixing to try to change the sensor and pray that works I will keep you all updated.