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1997 Jeep Grand Cherokee Question: Catalytic converter failure

 

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Robertpartnor, Cayce, SC, July 15, 2013, 15:42
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Check eng. light on. Scanner reads :P420" and indicates catalytic converter failure due to engine misfire or running condition or large vacuum leak or engine oil leakage into exhaust-valve guide seals. What can I expect in costs to narrow down the problem?

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