Hello all,

Error codes indicate the sensor 1/bank 1 O2 sensor is causing my check
engine light to come on once the engine warms up on my Montero. It
appears that sensor is located on the drivers (left side) and I have a
couple of questions I'm hoping someone may be able to answer. First,
how do I determine if it's a California or Federal model sensor (and
if I erred on the replacement, would it matter)? - I don't live in
California...

Next, what's the easiest access to this sensor? It appears that
perhaps popping loose the mud flapping material may allow access
through the wheel well. Thought I'd look for someone with experience
before getting into this.

Finally, I'm somewhat inclined to purchase the OEM replacement and was
looking at the Bosch replacement from Autozone. They also sell a
'universal' Bosch that is supposed to work fine. Anyone have opinions
on this? Any help is greatly appreciated.

John