Q: CE Light came on , got it checked and it said PO420. Couple of day later went off and has not come back on. 2011 Jeep Compass

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My light came on and then went off and stayed off . Is my converter going bad or is it just a sensor ?

My car has 90000 miles.
My car has an automatic transmission.

Hi there - yes, it is possible the catalytic converter has lost it’s ability to burn residual fuel. This could be due to an engine condition that has clogged the catalyst, or a failing oxygen sensor that is not adequately monitoring exhaust gases, and feeding bad data to engine management. The result is the same, inadequate catalytic converter functionality. I would recommend a Check Engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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