Part of the problem is you ordered an 02 sensor and you didn't tell them if it had advanced evap or not based on your vin number.
Why only one 02 sensor at your mileage you probably need all 4.

 

Ultra gauge shows all but one working, transition times voltage etc show good. One is slow and stays rich.

 

May be working, but if you are over 100,000 miles they are not giving your engine all the power it can use, in other words a 14 to 1 air fuel ratio.

 

nah they are working it passed emmisions and sniffer pipe last week while getting my inspection. near perfect ratios all around. It has new plugs wires etc. This one particular sensor would throw a pending code every so often. It became more often.

Dropping 300 dollars in december on sensors that currently work would **** off a pregnant wife, a 19 year old daughter and a santa clause budget. I like spending money but not like that.