O2 sensor replaced—wow

well you have convinced me now..... and I was just thinking/talking to myself "self, I think you are all caught up on the maintenance and mods for now... Just drive it and enjoy it". But then a new morning, a cup of coffee, sit at the computer to wake up and then boom you must get this part. LOLOL
 
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Paparock1 said:
well you have convinced me now..... and I was just thinking/talking to myself "self, I think you are all caught up on the maintenance and mods for now... Just drive it and enjoy it". But then a new morning, a cup of coffee, sit at the computer to wake up and then boom you must get this part. LOLOL
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X2
 
Be aware that changing out the upstream O2 sensor may unmask other minor issues in the fuel / ignition systems. Running slightly rich hides a multitude of sins.

Also, let the ECM settle out a bit before assuming that changing the O2 sensor broke something if there is any funkiness.
 
Zaythedad said:
Alright boys I’m getting mine Friday. Links? 04 rubi
I’ve been shamed lol
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RockAuto has the best prices that I’ve found. Might even find them on close out. Just make sure you go with NGK/NTK.
 
StG58 said:
Be aware that changing out the upstream O2 sensor may unmask other minor issues in the fuel / ignition systems. Running slightly rich hides a multitude of sins.

Also, let the ECM settle out a bit before assuming that changing the O2 sensor broke something if there is any funkiness.
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See now, I was feeling pretty good about this o2 sensor changing business. All the comments on how much it helped on this or that, then you have to go and scare me. LOL Not sure if I want to have to start "unmasking" things that are currently not known. LOL Maybe this is one of those, if its not broke, don't mess with it times. :D
 
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KimsJeep said:
See now, I was feeling pretty good about this o2 sensor changing business. All the comments on how much it helped on this or that, then you have to go and scare me. LOL Not sure if I want to have to start "unmasking" things that are currently not known. LOL Maybe this is one of those, if its not broke, don't mess with it times. :D
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You can't go wrong by replacing an upstream 02 sensor. If you don't know its age and you have intermittent hesitation or rough running, replace it.
It's too important (i.e. it determines the air/fuel mixture).
$30 - $35 If I recall and that's cheap for such an important sensor.
 
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Jerry Bransford said:
The downstream O2 sensor mounted on the catalytic converter on older TJs rarely goes bad and its only job is to monitor the cat for proper operation. It doesn't affect how the engine runs. I'd only replace the upstream O2 sensor on those older models without the pair of precats. :)
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@Jerry_Bransford , I’m just curious why the caveat at the end, only “those older models without the pair of precast.” What’s different about the newer models?
 
Aloha Joe said:
@Jerry_Bransford , I’m just curious why the caveat at the end, only “those older models without the pair of precast.” What’s different about the newer models?
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Older TJs don't have the pair of small pre-catalytic converters before the main catalytic converter, older models only have one catalytic converter. Newer TJs have three... two small pre-cats just under the exhaust headers and the main cat below them.
 
Jerry Bransford said:
Older TJs don't have the pair of small pre-catalytic converters before the main catalytic converter, older models only have one catalytic converter. Newer TJs have three... two small pre-cats just under the exhaust headers and the main cat below them.
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Thanks. Sorry, I should have been more clear - it sounds like it's more important on the newer TJ's to change the downstream O2 sensors and I was curious why that is.
 
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