O2 sensors at WOT?

[Mark Wilcutts]

On Mon, 2 Nov 1998, Bill the arcstarter wrote:

>  I've heard that most ECU's go into an open-loop condition while under 
> WOT.  I've also heard this is because most O2 sensors read incorrectly 
> under WOT conditions.
> 
> Why is that?  Does the increased gas flow cool the O2 sensor down too 
> much or what?

Might be because WOT enrichment pegs the O2 sensor to the rich side.