[s-cars] O2/Lambda sensor question

[Sean Douglas]

I'd start by replacing the thermostat, but being 10 years old, it may be
difficult to remove as the thermostat and the aluminum housing is
dissimilar metals and it may have "welded" itself to each other.

You haven't said how many km on your S6, but 100,000 km is considered to
be the interval for replacing the O2 sensor.

Sean
1997 S6

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Paul Heneghan
> Sent: Friday, January 06, 2006 9:06 AM
> To: s-car-list at audifans.com
> Subject: [s-cars] O2/Lambda sensor question
> 
> 
> My mpg has dropped enormously over the last couple of months. 
>  It's dropped from an indicated mid 20s to about 20 (I 
> presume these are good old-fashioned UK gallons, not the puny 
> little 80% US type).
> 
> First off, the car seems to be taking an age to get to 
> temperature - in fact channel 51 only seems to ever get to 
> 79, even when the dash gauge shows the normal temperature.  I 
> plan on changing the engine thermostat
> - I think I'm still on the original which is 10 years old now.  
> 
> I thought I would change the O2 sensor as I'm pretty sure the 
> original is still in there.  When I took the old one out, it 
> was covered in soot. Do I need to look at something else, or 
> could the rich condition be due to the cold engine, and a 
> failing O2 sensor?
> 
> Can you scrape the soot off and reuse them?
> 
> What about MAF?  DO they need to be replaced as a matter of routine?
> 
> Paul
> 1995 S6 Avant
> 1996 S6
> 
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