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Well title says it all. Started my 08' 3.0si this morning and MIL appeared.:( No biggie. My question is what sensor is Bank 2 Sensor 2 ? Can't seem to find which one it is. Is there anything I should check before I order a new O2 sensor ? Thanks

Huh, You think its a bad O2 sensor?

Which code is it? Sensor code or sensor HEATER circuit?

If you've damaged the wire to the sensor- cut it, crashed into a hard snow bank, hit something...or blown the fuse, the car will immediately see an open circuit on the O2 sensor preheat. It will then never attempt to use the O2 sensor itself.

It *CAN* also be in internal fault in the O2 sensor, wher ethe preheat side of it failed...not saying that is not possible.

If you clear the code it comes back immediately on start up, right? A bad o2 sensor will usually take some time to show up as out of range, but the open heater circuit is immediate.

Id check the connections to the sensor, AND the fuse. Could also ohm out the sensor. Once you rule out wiring/fuse, go order the sensor

GL

I haven't had time to check it yet. My questions still is where is bank 2 sensor 2 ? Can anyone be kind enough to point out which one it is ?

Sensor 2 is usually after cat, AKA 'downstream'.

Bank 1 is cyl 1-3, bank 2 4-6

HOWEVER, I just pulled that up with 30 seconds of google. Use at your own risk. Honesly google yourself or call a parts counter (or ping the company that is selling you the sensor) for your own info.

And...O2 sensors are a wear item. Buy both, replace both. Good for another 60k -100k

Bank # is left or right side of engine.
Bank 1 is on cylinder 1 side of the engine

Sensor # is a sensor location down and away from engine.
Sensor 1 is pre cat also called High side
Sensor 2 is post cat also called low side

Sensor 1 on both banks is used for air to fuel mixture measurement after burn cycle.
This sensor(s) is(are) one responsible for working with MAF (mass air flow sensor) to measure fuel/air mixture as it burns.

Sensor 2 is only responsible for catalysis. In other words Sensor 2 tells you if cat is good or bad.

O2 Sensor Identification and Locations - o2 sensors