A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

How to replace O2 sensor? (Pre-cat)

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Old Mar 27, 2008 | 09:19 AM
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Default How to replace O2 sensor? (Pre-cat)

I checked the FAQ to see if there was a guide on how to replace it, but didn't find anything. I got my new one...but have no idea how to get the old one off, any tips? Thanks.

--Asif
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Old Mar 27, 2008 | 09:22 AM
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Default go to autozone... rent 02 removal socket... spray pb blaster on it

remove 02 sensor
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Old Mar 27, 2008 | 09:22 AM
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Default Last time I was at a muffler shop, they had a special tool.

It was like a socket with a section of one side missing so that it would slide over the wiring.
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Old Mar 27, 2008 | 09:42 AM
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Run the engine a few minutes to warm it up (not to the hot point)
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Old Mar 27, 2008 | 09:44 AM
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any luck with the headlights?
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Old Mar 27, 2008 | 09:54 AM
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I have always just used an adjustable wrench.
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Old Mar 27, 2008 | 09:55 AM
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did you remove air box?
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Old Mar 27, 2008 | 10:01 AM
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O2 socket + extension + universal joint + ratchet = success
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Old Mar 27, 2008 | 11:06 AM
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Default PB is your friend

Spray PB blaster.
Wait an hour.
Spray PB blaster.
Wait an hour.
Spray PB blaster.
Wait an hour.
Spray PB blaster.
Wait an hour.
Spray PB blaster.
Wait an hour.
Spray PB blaster.
Go to bed.
Wake up.
Spray PB blaster.
Wait an hour.
Heat up car.
Remove O2 sensor.
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Old Mar 27, 2008 | 11:32 AM
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No luck yet. YGM
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