P0420 code

Asked by GuruTFLHD Jul 19, 2018 at 11:19 PM about the 1998 Jeep Cherokee Sport 2-Door 4WD

Question type: Maintenance & Repair

1 Answer
43,910

Hornet_2497 answered 6 years ago

Engine code P0420 means the catalyst is not working to maximum efficiency. Converter may be failing or rear O2 sensor is reading wrong. Engine misfiring allowing unburned gasoline to pass. Engine burning oil. Might just be begging for a thorough tune up.

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