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LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How do you know when O2's need to be replaced?

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Old Apr 28, 2008 | 11:09 AM
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94YellowTAGT's Avatar
94YellowTAGT
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From: Springfield, MO, USA
How do you know when O2's need to be replaced?
My car is running a little rich. What is the best way to tell if o2's are bad. I can scan with free scan but i don't know what the numbers are supposed to be.

Thanks,
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Old Apr 28, 2008 | 11:26 AM
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MARKTHOMASBRAND
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From: Stratford Upon Avon,United Kingdom
A really bad O2 will probably cause the SES light to come on.
I read somewhere that they should be replaced at about the 50,000 mile mark.
Regards,Mark.
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Old Apr 28, 2008 | 11:27 AM
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94YellowTAGT
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It has been around 30000 miles or so since i replaced them last. But that has been around 5 years?
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Old Apr 28, 2008 | 03:54 PM
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with bad 02s the car usually sputters and gives off an occasional backfire.
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Old Apr 28, 2008 | 04:20 PM
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94YellowTAGT
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I am just trying to figure out why my mileage is only 21 with 95% 65 mph driving? I will get a good scan tomorrow and maybe make a new post and hope someone will find a problem.
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Old Apr 29, 2008 | 12:02 AM
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mad95z
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Originally Posted by 94YellowTAGT
I am just trying to figure out why my mileage is only 21 with 95% 65 mph driving? I will get a good scan tomorrow and maybe make a new post and hope someone will find a problem.
Your MV readings should move up and down, if they are sluggish or dont move there wearing out.

Wish my mileage was that good!
Last edited by mad95z; Apr 29, 2008 at 12:04 AM.
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