right 02 sensor voltage 5.0!
 

Today (raining) my right 02 started reading richer than hell 5.0vdc (which is max) and then, winding down slowly to about 1.5 vdc at cruise (2500 rpm @ 70 mph)...

the left does the same as always, boucing btwn .2 vdc - .7vdc (I know .46 is ideal but these are factory sensors, the wideband is going in this w-end)

any guesses? I'm taking it apart tomorrow...

Re: right 02 sensor voltage 5.0!
 

Either the O2 went fubar (shorted thimble to heater, internal), or you have a short to power or VREF somewhere in the wiring. The O2s don't use 5vdc reference voltage, they produce their own. My 2¢.