When it rains it pours. ODB P0420.

After doing all this work to the front end, halfway through my breakin miles for my new gears the Jeep starts up with this shit.

Any odds that it might NOT be the cat? I know the JKs have their own reading for the sensors.

2007 JK X w/67k

Dealer appointment next week (ext warranty), but wondering if anyone has any ideas other than the cat? Headers don't seem to be cracked, but I need to find my stethoscope.

Could be a bad 02 sensor


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It could be the catalytic converters or bad o2 sensors. The catalytic converters should be covered by your extended warranty and the emissions warranty you still have from the factory. If it’s an o2 sensor I don’t think those are covered but I’m not 100% sure.


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