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O2 problems/qestions

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Old May 8, 2007 | 06:22 PM
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speedracer1280's Avatar
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Default O2 problems/qestions

I recently added mac mid tube headers with emissions hooked up...no cats y pipe...left it open...i did not weld the rest of the pipes together because will be dropping the trans this weekend..

a friend got the o2s for the drivers side mixed up...front and back..so we installed our best guess...on the drive it appeared not to be switching very quickly...so installed the other one...same thing...well more i drove it more, it switched faster..is much better now... but qestion is does it matter which one is where? autozone has 4 diff part #s...well thunder racings O2s so it will work ethier way...what do ya'll think???? Is an O2 sensor a just O2..no matter which end it is installed...
Also what is rich....anything over 900mv? what is it supposed to be???

i forgot...the car is a 99 ta a4...runs perfect..its totally stock...and ran good till i started messing with it..
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Old May 8, 2007 | 08:21 PM
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theyre all the same and its not gonna matter. when my front 02's go out im gonna use my old back ones till they crap out
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Old May 8, 2007 | 08:39 PM
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thanks for the response...i thought so but wanted some input...do you know if 900mv is the norm and above that is rich or lean?
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