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Discussion Starter #1
Hi there,

I just bought a second hand JK and straight away I got codes 420 and 430. I took it back to the dealer and their mechanic said that sensors are reading fine and mumbled something about dealership using cheap fuel and said I should fill it up with premium. I am not a car mechanic and don't know much about engines, but I read quickly that sensors are supposed show if catalyst converter is working, which in my thinking has not much to do with premium or not premium fuel.
So, I bought ODB2 reader to see what is going on with sensors. I attached sensor 1 and 2 readings from bank 1, which were taken while driving steady 90km/h on motorway with a plenty warming up done beforehand.
Would anyone be able to see if those are indicating bad catalyst converter or sensor(s)? To me it looks like sensor 2 might be not be steady enough i.e. converter is not working well enough, but I haven't seen these readings enough to draw a definite conclusion.
 

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I am getting back on Wranglers. I used to have 2005 model few years back, which was automatic and now this is a manual. It takes time to learn to have a clutch again after more than 10 years of automatic cars.



:Thanx:
 

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I am not an expert on these being able to tell but from those graphs, it looks like the o2s are working. I have been taught that most codes if you direction or a place to start. The P0420 and P0430 are somewhat of an exception. If those show up, you have bad cats. The only thing to really verify is if the O2s are responding correctly. You can do that by pulling vacuum line which should cause the O2s to go lean (below .500v) or snap throttle which will cause a rich (way above 500mv).

Pretty sure you have 2 bad catalytic converters. It's not bad gas or whatever line of BS they gave you.
 

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Discussion Starter #5
Hi sequel,


Thanks for the ideas how to verify the sensor. I have to give it ago on this weekend.


I am taking it back to the dealer anyway. The engine warning light is not supposed to come up on a properly working car regardless of the reason.


Cheers.
 

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Hi sequel,


Thanks for the ideas how to verify the sensor. I have to give it ago on this weekend.


I am taking it back to the dealer anyway. The engine warning light is not supposed to come up on a properly working car regardless of the reason.


Cheers.
Hello giip,

We're going to keep an eye out for your future updates. If any assistance is needed while in service, please don't hesitate to reach out.

Jamsine
Jeep Social Care Specialist
 

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Not trying to hijack here, but on the topic of bad cat converters. If they're bad and they are not replaced what's the consequences going to be?
 
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