Jeep TJ Cats

Liftedtj

Well-Known Member
Joined
Jan 13, 2014
Keep getting code P0153 on jeep 06 Jeep TJ 4.0. Replaced all 02 sensors with NTK 170k on jeep so I replaced them all. At operating temp bank 2 cat reads about 300 degrees hotter than the other. So I’m just going to replace the mid pipe and was looking for some suggestions Walker,Flowmaster, Mangnaflow brands? Any suggestions would be appreciated.

Thanks
 
Temp readings aside, how does the downstream sensor respond as compared to the upstream on the same bank? Is the downstream sensor voltage fluctuating more than 0.15 volts at idle?
 
Jody Treadway said:
Temp readings aside, how does the downstream sensor respond as compared to the upstream on the same bank? Is the downstream sensor voltage fluctuating more than 0.15 volts at idle?
Click to expand...
Haven't went that route yet to check. Code comes and goes. Jeep runs great in the morning on beach trips. But we just came back last weekend and didn’t leave Hatteras till lunch. Check engine light came on after about driving for a HR. I usually get 250-260 miles off a tank. I was only getting 125 miles off a tank. Got home ran the code and it was P0153 bank 2 sensor 1. It’s done this multiple times coming home on trips in the heat of the day.
 
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Graph showing at idle
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Graph while driving
1691757825799.png
 
The voltage on the downstream sensor fluctuating like it is doing shows the converter isn't efficient. A properly functioning cat will be evident by a steady downstream sensor signal.
When the DS sensor mimics the upstream one, it shows the cat isn't doing it's job.
 
Jody Treadway said:
The voltage on the downstream sensor fluctuating like it is doing shows the converter isn't efficient. A properly functioning cat will be evident by a steady downstream sensor signal.
When the DS sensor mimics the upstream one, it shows the cat isn't doing it's job.
Click to expand...
10-4

Thanks for the response.
 
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