O2 sensor readings over 900 mV

[Coelacanth]

My data logs show max O2 readings exceeding 900 mV quite often. I get no errors but I've read the readings should be between 0.1 and 0.9 volts. What would cause readings over 900 mV? The obvious thing would be to replace a wonky O2 sensor, but wouldn't it throw a code if it was out of range?

 

[Eric Stage I]

What scantool? Sounds like it's not a typical turbo Buick scantool.

 

[Coelacanth]

12-pin ALDL adapter from 1320electronics.com and ALDLDroid.

 

[Eric Stage I]

Ok. That won't show O2 readings that you can compare to the typical Buick scantools. When the rest of us tune for .780-,800 at WOT, you'll be up around .950's.

 

[Coelacanth]

Sounds good, thanks Eric...I'll consider it's normal then, and not worry about it. I'll be adjusting IAC and TPS tonight or tomorrow.