Drivers side behind the cat. :)
The 2000 Mazda Miata O2 sensor bank 1 is located on the firewall in the engine compartment. The sensor can be found on the passenger side of the firewall.
location bank 1 sensor 1
Bank 1 sensor 2 would be the sensor after the behind the catalytic converter.
Bank 1 is the bank of the engine that contains #1 cylinder. Bank 2 is the other bank. Sensor 1 is located before the catalytic converter. Sensor 2 is located after the cat converter.
That should be the sensor located after the catalytic converter.
bank 2 sensor 2 is the passenger side, rear sensor, it is located behide the catalytic converter.
Bank one are before the Cat and bank 2 are after the Cat.
Bank 2, Sensor 1 is located on the front of the engine(radiator side), before the first catalytic converter.
under the hoody
Bank 1 refers to the side of the engine where the number 1 cylinder is located and sensor 2 is the down stream or after the catalytic converter sensor.
Driver side
2000 jimmy 4.3ltr v6. were is the o2 sensor bank 1, sensor 3