What does a computer code p0420 mean

2004 CHRYSLER PACIFICA
83,000 MILES • 4 CYL • FWD • AUTOMATIC
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IAN
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I had the check engine light come on and was told that the code came up as p0420. He told me that it is a problem with the catalyic converter and that it would have to be replaced.

could other things cause this error? If i replaced the converter then how much should it cost?

Nov 11, 2011 at 2:28 PM
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HMAC300
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yes this is catalytic converter code but it could be something else besides that. converter costs vary depending on where you are but i would assume in the range of $500. but check for a coolantleak as this cold cause the converter to give that code or one of the O2 sensors not working correctly.
Nov 11, 2011 at 3:20 PM