Software Updates

Do you have an OBD scanner? My CEL/MIL was intermittently on with my one incorrect 02 sensor, but the code stayed stored in the computer.

I also felt that my Jeep is still running rich after swapping the O2 sensor. IDK if this is relevant to this thread but I read something about disconnecting the battery for 15min after changing the sensor to let the ECU “relearn” normal. I did that last night and the Jeep definitely was doing some learning (adjusting idle possibly). It’s only been 2 short rides since so I don’t have complete data on that. Maybe it’s placebo but I feel like something has slightly improved.
 
The saga continues..... Replaced both upstream sensors with the ngk ones but they had to cut the wires and solder them on to the old plugs as thw plugs didnt fit. I was ok with this at first as the light was off. Later on on it went again. So i took it to yet another garage who specialise in jeeps and they told me my car only has two 02 sensors..... Wtf..... Anyway.... The p2098 code is still hanging around.... Their advice was to take it back to the previous place and complain until they get the correct ones fitted. But seriously.... How many sensors are in a 2004 jeep wrangler sahara with the 4l straight 6? Can someone please confirm?
 
There are 2 O2 sensors upstream of the catalytic converters, and 2 downstream for a total of 4.

The 2 upstream can/will affect the way the engine runs, but they can all throw a code.
 
So it is finally finally fixed.....

The cats had completely broken up in the exhaust and were blocking up the whole system. That was problem no. 1. To solve that I had to do the software where they just write the 2 downstream sensors out of the PCM, remove all traces of the broken up burnt out cats and the third cat as well (which was clogged up by all the top cat debris). It now officially has only 2 sensors upstream. Both of these sensors were also replaced. It does not seem to like to the one and was throwing out the P1033 Bank 1 Sensor 1 code but that has also seemed to have stopped now. It is running really well and is even a bit lighter on fuel. What an expensive and frustrating saga! Thank you for all the help here!
 
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Hi All

More joys with the 02 sensors....yesterday I had P1053 come a long to celebrate life with me.....
The following was done as it was done with P1033....
Both of the upstream sensor alerts have now been coded out of the PCM as well (P1033 and P1053 which are the codes for the 2 upstream 02 sensors). For some reason the car does not like the 2 new NGK sensors I installed thus codes being thrown. I now know that the sensors are an issue and I have to find ones that my car likes. In time the idling and fuel consumption will start to get affected....who knows when because now I will go by the mechanical feel of the car and not the engine light....so I have bought myself some time to try different things. Since I have already replaced both of these with the NGKs and it doesn't like it....have now been recommended the Bosch ones which I have read that the TJs really do not like. Are there any other types to try or would it be best to spend the extra cash and get the original Jeep part?
Appreciated....
 
No idea what's going down with your mechanic, however, buy your parts from rockauto.com and get them shipped to you. I save a fortune getting my parts shipped from the US to Australia this way, normally takes a week shipping time. I generally find quality brand name parts are hard to get here or just stupidly expensive.

The NTK 02 sensors are between US$35 and US$45 each plus shipping. They should connect directly to the loom plugs, something sounds fishy to me if they don't. Part numbers are on here in the 02 sensor thread.

I also purchased a full Magnaflow front exhaust section with new cats, all of this is easy to fit and you can save a fortune doing it with a simple socket set.
 
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