[V8] New 02 sensor, all is well - or is it?

Ingo Rautenberg i.rautenberg at waratap.com
Mon Jun 12 12:29:09 EDT 2006


Don't dismiss the Oxygen sensor quite yet.  All was good for 100  
miles, eh?  Then something was working.  Get underneath and check the  
wiring.  It is VERY easy to have the wires contact the exhaust and  
make the sensor useless.  Please confirm.  OTOH, of you have an  
overly rich mixture in one or more cylinders and the OXS cannot  
compensate adequately, then you may have another problem.  I'd check  
the OXS wiring first and then after running the engine for a while,  
check all the spark plugs to see if they are all even or if one or  
more indicates a too-rich condition.


On Jun 12, 2006, at 12:13 PM, Carter Johnson wrote:

> Got the new O2 sensor installed on Saturday.  Reset the fault code,  
> car seemed to be running well.  Drove ~100 miles between then and  
> today.  I was getting ~23 mpg again, car running well, no smoke at  
> WOT.  YEAH!  And then, just when I was marveling at what a  
> difference that made, I smelled that raw, unburnt fuel smell.  Uh  
> oh....look down and the CEL comes on.  Given the symptoms (same as  
> before) it would appear that the O2 sensor was, in fact, not the  
> problem.
>   Ok, now what?
>   Carter
> W. Carter Johnson
> SileStone/Counterfitt of RI
> 401-573-2399
> Too many Audis:
> 1986 Coupe GT
> 1985 Coupe GT
> 1993 V8 Quattro
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