US-centric eh? So on a RHD car in the UK, it would be the one on the DRIVER'S side - i.e. when looking from the front of the car, it'd be on the left? And Bank 2 Sensor 2 would be the one just to the right of the leftmost pock-marked heatshield? I need to change mine urgently (MOT required) and want to be sure I replace the correct one! I'll take a photo for further clarification and re-post here....



Would this, in the centre of the image, be the Bank 2 Pre-cat O2 Sensor ?

And if so, could someone please post a corresponding image of the Bank 2 Post-cat sensor, i.e. Bank 2 Sensor 2 ?
A picture is worth a gazillion words, and may put an end to many debates regarding left/right/front/rear/pre/post etc.