A few weeks ago my car started throwing a P0420 (Catalytic converter below threshold). I had the code cleared, it then came back on and proceeded to go back off on its own a week later. It returned a few days ago so now I am trying to figure out if this is a catalytic converter issue or an O2 sensor issue. I am wondering if anyone has any input or past experience with this on their compass. I have
attached a graph of my O2 sensor voltage from my scanner for reference. From the looks of it, the catalytic converter seems to be doing its job from these graphs, but I am no expert.
Thanks in advance for the input!
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attached a graph of my O2 sensor voltage from my scanner for reference. From the looks of it, the catalytic converter seems to be doing its job from these graphs, but I am no expert.
Thanks in advance for the input!
