2002 Pontiac Grand Prix O2 sensor

2002 Pontiac Grand Prix 4 cyl Front Wheel Drive Automatic

Is there a way to get a diagram of exactly where the O2 sensor goes for a 2002 Pontiac Grand Prix? We have been looking online for a diagram and can't find one. We know what is wrong, had it tested to make sure but can't locate it exactly on the vehicle.

Thanks for your time and input!