Cat temps soaring!
 

Anyone know what the operating temp range for our cats? I measured 1100 degrees yesterday after a casual 30-40 min highway drive and some in town errands. I’m starting to think it has failed.

Nope, sounds about right. I've seen much higher during longer highway cruising.

Thanks! Just wanted to make sure.

You wouldn’t happen to know the specified acceptable voltage range of the downstream O2 sensor would you? Mine is constantly reading .750- .800 which seems rich to me.