Why isn’t the catalytic converter on my Chrysler 300 working?

My Chrysler 300 just failed an emissions test and the mechanic said my catalytic converter wasn’t working properly. What would have caused my catalytic converter to stop working?

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Answer provided by
Megan Lebron
Answered on May 27, 2022
Having your Chrysler 300 fail an emissions test can be a big headache, but tracking down the exact issue with your catalytic converter can help you repair the problem and get your car retested.
Here are some common issues that might cause your catalytic converter to stop functioning properly:
  • Clogs: Engine oil or coolant can leak into your catalytic converter and clog it up. Have a mechanic check your engine gaskets and fluid lines for leaks.
  • Overheating: A misfiring spark plug or leaking exhaust valve can cause a buildup of unburned fuel, which will overheat your catalytic converter.
  • Physical damage: Since your catalytic converter sits under your car, it’s possible a rock or other debris caused some cracks or other damage.
Having a mechanic give your car a thorough inspection can help you find the source of your catalytic converter problems and get you on your way to necessary repairs. To help save up for those repairs, download Jerry.
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