Any help on this would be appreciated. 2003 tj sport, 4L.
I've got the following codes displaying
P0300 - multiple misfires
P0304 - cylinder 4 misfire
P0420 - catalyst system efficiency below threshold bank 1
P0155 - o2 sensor heater bank 2 sensor 1
P0161 - o2 sensor heater bank 2 sensor 2
P0138 - o2 sensor heater bank 1 sensor 2
P0306 - cylinder 6 misfire
P0432 - catalyst system efficiency below threshold bank 2
Now the 2 catalyst codes would be because I've ripped the cats out a while back, so I'm not too concerned about those. In addition to the heater and misfire codes though, the jeep will sometimes hold at 1500-2200 rpms after I let off the throttle and not sure if it's related, but the odometer will sometimes go dimmer or brighter.
I replaced the spark plugs about 20000 kms ago with the auto light iridium tipped plugs (or whatever ones were recommended on this forum, can't quite remember)
Is this a grounding issue or something else?
I've got the following codes displaying
P0300 - multiple misfires
P0304 - cylinder 4 misfire
P0420 - catalyst system efficiency below threshold bank 1
P0155 - o2 sensor heater bank 2 sensor 1
P0161 - o2 sensor heater bank 2 sensor 2
P0138 - o2 sensor heater bank 1 sensor 2
P0306 - cylinder 6 misfire
P0432 - catalyst system efficiency below threshold bank 2
Now the 2 catalyst codes would be because I've ripped the cats out a while back, so I'm not too concerned about those. In addition to the heater and misfire codes though, the jeep will sometimes hold at 1500-2200 rpms after I let off the throttle and not sure if it's related, but the odometer will sometimes go dimmer or brighter.
I replaced the spark plugs about 20000 kms ago with the auto light iridium tipped plugs (or whatever ones were recommended on this forum, can't quite remember)
Is this a grounding issue or something else?