Re: O2 Sensor

[Mark Eissler <tequila@interlog.com>]

gregsj@mail.imm.com wrote:

>A few weeks ago, with regard to my '91 200 TQW, I asked for more 
>information as 
>to exactly what the O2 sensor does, what it should cost to replace it, and 
>whether a "shade-tree" mechanic could to it or if it requires a "real" Audi 
>mechanic. No answers as yet -- I sure could use some help. TIA. Greg
>

The 02 sensor works in conjunction with the fuel control computer. It 
measures the exhaust gases and sends the info back to the computer which 
determines whether or not your engine is running too rich or too lean and 
makes the appropriate adjustments.

If the sensor is bad, you will likely notice some power loss and along 
with hesitation.

You can replace the sensor yourself. You will likely want to purchase an 
02 socket that has a groove in it for the wire that's permanently 
attached to the top of the sensor. The sensor is located in the exhaust 
pipe near the engine.

One more thing to note: gasket sealer and any other compound that may be 
used in conjunction with the crankcase, valve cover, etc. (generally any 
part of the engine that may come into contact with the oil in the engine) 
MUST indicate that it is "oxygen sensor safe." These compound can wreck 
an 02 sensor.

Hope this helps.



Mark Eissler          | UNIX, DOS, oh and MacOS too.
tequila@interlog.com  | Why wouldn't a developer use 
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