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I just had my Jeep in for the recall of the Cat, and it was re-programmed.

Now after 5 weeks i got a check engine light. I ran the Fault code and got a 72 which say Catalyst efficiency below required level. The Dealer told me the Cat was fine after the re-program now i have to bring it back to the dealer with this problem. Waiting on an answer.

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16y ago
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Q: 96 jeep gc 4.0 72 fault code what does it mean?
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