JK_Oman

I've got this code P0430 CATALYST EFFICIENCY (BANK 2)

went to a muffler shop, checked everything no damage found

but the code came again, could it be the sensor itself?

derby911

most likely a bad cat should be covered under warranty at least to 50'000 miles

ronjenx

This is from the FSM:

Theory of Operation
The State of Change (SOC) catalyst monitor uses the signals from both the upstream and downstream O2 sensors to detect aging of the catalyst. Based on the fact that when a catalyst ages, it loses some of its Oxygen Storage Capacity (OSC). As a result, part of the untreated exhaust gases can breakthrough the catalyst and causes the downstream O2 sensor to deviate from its neutral (Stoichiometric) position. By observing the activities in the downstream O2 signal, the degradation level of catalyst can be detected. In general, the higher the downstream O2 sensor SOC value, the more exhaust gas breakthrough and the lower the OSC of the catalytic converter.

When Monitored:
ECT above 70° C (158° F), engine RPM between 1400 and 2300, vehicle speed between 64 and 96 kph (40 and 60 mph), and engine run time greater than 3 minutes.

Set Condition:
If the final State of Change index is within the calibrated fail threshold. Two trip fault. Three good trips to turn off the MIL.


Possible Causes

O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND

O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND

O2 RETURN UPSTREAM CIRCUIT OPEN

O2 RETURN DOWNSTREAM CIRCUIT OPEN

EXHAUST LEAK

ENGINE MECHANICAL CONDITION

AGING O2 SENSOR

CATALYTIC CONVERTER

JK_Oman

I will take it to the dealer to get it checked soon.

I've cleared the code yesterday and till now it didnt came again.

could it be a bad sensor?

i have the borla long tube headers on top of my list and as borla guys claims " it will be a code free enviroment and will gain from 18 to 24 HP".

ronjenx

I had good performance gain with Borla headers on my '88 XJ.

Let us know what you actually see on your JK.

Jwilk

Did you ever figure out what was causing p0430? I'm experiencing the same thing.

Steel Rain

Work in progress!!

Jwilk

Took mine into the dealer and it was the catalytic converter. It was covered under warranty.

74CJ5

Just had this come up as well. How long is that warranty going to cover it? I just hit 54,000 miles.

dsp

I think the emissions is for 70k.