Hello everyone, I have a question for you. I have a 2007 Yukon XL Denali that I just purchased from a gentleman. The tire pressure sensor light was on and the check engine light was on. My husband used his code reader and it said that it was for the oxygen sensors. We took it to the shop and the mechanic changed all four of the O2 sensors and the check engine light went off for about 20 minutes and came back on. Has anyone had this problem before? can anyone tell me what’s wrong? And the tire pressure sensor warning is still on.