Scanmaster reading O2

[fast400]

Today I took the TTA out for a drive. Hit WOT once or twice and notice that my scanmaster logged really low mV for the O2's....003! This was while I was WOT. There was no knock retard...
Is this a sign of a bad O2 sensor? Anyone else have this happen?
It ran great while I hit it.

 

[WS6]

I'd be watching the cross counts of the O2. It may not switch much at WOT or idle. But it should rest the counter pretty often.

 

[jarredsoon]

ya I would figure it is time for a new O2. If you do alot of WOT it would not hurt to install a new sensor, even with the no knock retard.