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Can a bad catalytic converter cause your car to rough idle?

I’ve noticed that when my car has been shaking or vibrating while idling. After some troubleshooting, I’m pretty certain that the fuel injectors, spark plugs, and air filters aren’t the problem. But could a faulty catalytic converter be causing the rough idle?

avatar
Annette Maxon · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Well, you’ve definitely done your homework!
Yes, a bad catalytic converter can cause a rough idle. This is because less exhaust will be able to escape, in turn reducing the amount of oxygen that can enter and combust in the engine.
It’s best practice to replace the catalytic converter sooner than later. Though it’s not dangerous to drive short distances with a faulty converter, driving with one for extended periods of time will damage your engine.
However, now’s a good time to check your insurance policy for
towing and labor coverage
—this additional coverage may help cover the labor costs involved with this repair.
If you don’t have towing and labor coverage or are interested in finding a better insurance policy,
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Jerry partners with more than 50 insurance companies, but our content is independently researched, written, and fact-checked by our team of editors and agents. We aren’t paid for reviews or other content.

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