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Discussion Starter · #1 ·
99 TJ 2.5 Liter
Ok what can cause the O2 sensor to fail?? Besides coolant leaking into engine
I've already changed the number 1upper sensor twice and it keeps failing after 2-3 days

I'm going crazy, just had engine rebuilt and blown head gasket work completed.

I can't figure it out need help!!!
 

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When my cat failed, it took out the O2 sensor. Pretty common issue from what I've seen with the cats not holding up, and apparently when they start to go, they can damage the sensor. Not sure if that has anything to do with your issue though.
 

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Discussion Starter · #3 ·
Schmo said:
When my cat failed, it took out the O2 sensor. Pretty common issue from what I've seen with the cats not holding up, and apparently when they start to go, they can damage the sensor. Not sure if that has anything to do with your issue though.
Wouldn't the back sensor go bad too??
Code is only telling me front one the number 1.
 

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Sorry man, that's the only experience I've had with O2 sensors . . . anything thing else and I'd be talking out my ass.
 

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Why do you think it's a sensor failure? Misinterpreting the code?

What code are you getting?
 

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Discussion Starter · #6 ·
rrich said:
Why do you think it's a sensor failure? Misinterpreting the code?

What code are you getting?
Well it's not a code the expensive computer diagnostic my uncle has actually tells us it's o2 sensor # 1.
 

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What are the symptoms you are experiencing? Trouble running?

Failing how? What tests?

After so many sensors I'd think something else is making it look like it's failing, if at all.
 

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Discussion Starter · #8 ·
rrich said:
What are the symptoms you are experiencing? Trouble running?

Failing how? What tests?

After so many sensors I'd think something else is making it look like it's failing, if at all.
Engine shakes a little and I hear a weird rattle coming from the exhaust.
 

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What is his scanner showing for that O2 sensor- voltages, cross counts etc?
 
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