Question about 1996 Jeep Cherokee Sport

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Jeep cherokee check engine light is on

I have a 1996 jeep cherokee sport that i put a gibson exhaust system on and since then the check engine has been on and the trouble code is 420,what dose this mean? i have tried clearing the codes many times and it keeps coming back on.the front end also shutters between 45 and 55 mph

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P0420 Catalyst System Efficiency Below Threshold (Bank 1)
do u have a catalytic converter, did u leave the sensor disconnected just to the rear of the catalyst?

Posted on May 27, 2009

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The catalytic convertor has a Oxygen sensor in the front and behind it. One of the two oxygen sensors is not reading correctly. One should read a constant same thing and the other should flucuate between two different points. This could not be happening. The engine coolant sensor is not reading correctly. Or a retarded spark timing. I hope this helps. I recommend that you replace the oxygen sensor

Posted on May 27, 2009

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