1997 Jeep Cherokee Getting P420 Code

1997 JEEP CHEROKEE
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DPLOOF
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1997 Jeep Cherokee 4 cyl 81000 miles
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Need to know what to look for with an OBDII P420 code
Dec 22, 2007 at 6:01 PM
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MERLIN2021
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Bank 1 catalyst effeciency below threshold.
Check the converter for a broken bed...tap on it with a rubber mallet or perform a backpressure test on the exhuast!
Dec 22, 2007 at 6:36 PM
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SERVICE WRITER
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YEah Merlin is right, most often you'll find the solution to be a bad cat.
Dec 23, 2007 at 11:37 AM
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