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Old 04-04-2011, 03:32 PM   #1
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Effects of having a bad o2 sensor

98 sport 4.0 5 speed close to 200,000 miles
My o2 sensor on the cat is out,what's the effects of running this way

I had a 99 eclipse that had an o2 sensor on the manifold that was bad and it was getting 10 miles per gallon,I unplugged it andsure the check engine light stayed on but I got my 35 mpg back and for 150k miles it ran fine

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Old 04-04-2011, 03:37 PM   #2
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I have a 97 TJ both of mine were bad and it would not run right no power and so on. After changing them it had more power and ran right. thats all I know.lol

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Old 04-04-2011, 03:47 PM   #3
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The single downstream 02 sensor that is mounted on the cat on an older TJ like yours really only checks that the catalytic converter is working. It should have zero to very little effect on how the engine runs, its main job is to just verify that the cat is working. If it's not, it will cause the Check Engine light to illuminate. The upstream 02 sensor bears the primary responsibility for the air-fuel mixture which directly affects how well the engine runs and its fuel efficiency (mpg).

Newer TJs with a total of four 02 sensors (two upstream and two downstream) are affected in more ways when either of their two downstream 02 sensors go bad.
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Old 04-04-2011, 04:04 PM   #4
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Jerry I can not thank you enough for the info you have given for this past month

Thankz
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Old 04-04-2011, 04:50 PM   #5
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problem solved,When I changed my clutch yesterday I must have pulled a wire out the plug,plugged it back in

onto other problems...what controls the 4wd light....its not working after the clutch change
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Old 04-04-2011, 04:53 PM   #6
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The 4x4 light is connected to the 4x4 switch inside the transfer case. The switch's connector is located on top of the transfer case on the passenger side, you might have forgotten to reconnect it after completing your clutch swap.
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Old 04-04-2011, 05:46 PM   #7
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shes plugged in
perhaps its a loose connection,when I can get some help ill wobble it and have someone check the light......no big deal I know when my Jeeps in 4wd
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Old 04-04-2011, 09:15 PM   #8
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Can a bad O2 sensor cause lurching & bucking in 1st & 2nd gear?
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Old 04-05-2011, 01:45 AM   #9
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Quote:
Originally Posted by MLaborde
Can a bad O2 sensor cause lurching & bucking in 1st & 2nd gear?
Yes, as well as back firing. However there are several faulty components that can result in the same effect. There are several threads on fuel related problems. Faulty O2 sensors, faulty Throttle Position sensors, faulty fuel pump module are just a few components that could be the cause of what you are experiencing. My TJ does the same within the first five minutes after engine start (both cold and warm engine), after a few minutes of just idling the problem goes away, until the next engine start. Cheers.

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