My 2013 Chevy Equinox with the 2.4L is showing a P0420 code. The code first appeared a few weeks ago, turned itself off after a few days and then returned. I took it into a trusted shop and they recommended to start with replacing the 02 sensors. They wanted an arm and a leg to do the job so I replaced them myself using GM/AC Delco sensors. (I’m fairly mechanically inclined and have a good assortment of tools. Most of my experience is with older vehicles and I don’t have access to high tech scan tools or experience with modern vehicle diagnostics but I’m more than capable of replacing parts and doing basic repairs). After a few days of normal driving the code turned itself off and I assumed the problem was solved. Now, another two weeks or so have passed and the CEL is back on showing the same P0420 code. Other then the CEL the car is not exhibiting any other symptoms, e.g. no noticeable difference in fuel economy or loss of power.
Shortly after we got the vehicle we experienced the classic oil consumption issues. We had the piston rings done etc.. in 2019 at a GM dealership (and were lucky to be reimbursed). Since the fix we have not experienced any other oil consumption issues. My best guess is that the excessive oil consumption in the past damaged the catalytic converter and it is just now giving out. I’m guessing the next move is to replace the catalytic converter but I was hoping for some advice before I go off and replace expensive parts. When possible I like to diagnose problems rather then just be a parts replacer!
Thanks so much in advance for all the help!
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