bank one is the rear head, sensor 2 would be the lower one
it has 4 o2 sensors #1 cylinder is sensor 1 or bank 1 sensorType your answer here...
Bank 1 refers to bank of cylinders. You probably got a triple code code that said something along the line of Bank 1 not optimal or something like that. What it means is that your first bank of cylinders running lean. This is usually caused by fuel injectors, or a leaky manifold. Give me your triple code and I will tell you more.
po421 is catalytic converter problem rear bank
You did not specify which O2 sensor it is. Is it sensor 1 bank 1, sensor 2 bank 2, sensor 2 bank 1, or sensor 1 bank 2. There are four O2 sensors on a mazda 626
The bank 2 is located on the driver side of the engine on the Mazda Tribute. The Sensor 2 is located after the catalytic converter.
It is located posterior of the flux-capacitor, to the left of the y-pipe's s bend.
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.
Is this bank 2 sensor 1 or sensor 2?
That should be the sensor after the catalytic converter.
left(front) bank. middle coil(2-4-6)
That would be the sensor after the catalytic converter.
The bank 1, sensor 3, O2 sensor would be the O2 sensor post cat.