Wide Band O2 Measurement

[Franc Buxton]

Robert Wimmer wrote:
> 
> A local dyno shop that I spoke with claimed that their wideband meter
> could accurately measure O2 downstream of the cats.  I always assumed
> that any O2 measurement (for A/F ratio) had to take place in front of
> the cats since they use some of the O2 to convert CO into CO2.  Who is
> correct?
> 
	I thought the idea of cats was to mop up the mess made by the
engine, in which case they are wrong, as the cats would just be working
harder (or not, depending on the engine emissions), so would mask the
effects which need to be observed. I'd be very interested in a fully-
knowledgeable answer....

	Regards,
		Franc.
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