Here is how you guys can tell, which bank it is...Rule of thumb..Bank 1 is where the first piston firing order is.....Which in the Honda Ridgeline is in the rear...If you look at the motor its side ways ok...The best way to judge the first piston is to look at the spart plug cover....the one that is the closest to you is the first piston....Remember your looking at the engine as if it were straight, however honda ridgeline is side ways...So the front of the piston is on the passenger side...Ok...I hope this helps...
Upstream its before the catalytic converter.
Fig. Fig. 3: Oxygen sensor-4.3L engines
Fig. Fig. 4: Oxygen sensor-5.0L and 5.7L engines
Fig. Fig. 5: Oxygen sensor-7.4L engines
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (the one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Hope helps (remember to rate this).
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