O2 sensor readings

[John O Hornfeck]

Ok, all you O2 experts:
I nstalled my K&N A/F meter today on my MR2T and all seemed fine.
The little lights up&down,up&down, then I go out on the highway and
after 15 min of 70mph NO lights. "Oh damn, junk meter." BUT it starts
working during the cool down (~4min). So I drive it some more in town
and everythings fine. BUT when I take it out on the thru-way again the
read out is gone, returning only after during prolonged idle.

What the heck????

John O