what is the catalytic converter and how do you know when its going bad

Asked by May 21, 2013 at 02:18 AM about the 2004 Ford Taurus SEL

Question type: Maintenance & Repair

My car is beginning to sound loud and  running rough. sounds like its  mis-firing.. I have  a
2004 Ford Taurus Sel with 101790 miles on it. I'd also like to know the price range for
getting it repaired

2 Answers


A catalytic converter is a vehicle emissions control device which converts toxic byproducts of combustion in the exhaust of an internal combustion engine to less toxic substances by way of catalysed chemical reactions. Yours should still be good. You will get a CEL if the downstream O2 sensor detects a out of range condition. --- You just might need the exhaust system replaced.

6 of 6 people found this helpful.

Agreed. Cats don't usually make an engine louder, they tend to plug up an exhaust system and set a Check Engine light. A cracked exhaust manifold (rare) or a damaged/rotted muffler is more likely the cause. A lot of muffler shops will check it out for free or nearly free. Go to a couple and see what they say.

3 of 3 people found this helpful.

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