Bank 1 is always the same side as the number one cylinder. Bank 2 is the other side of the engine. Sensor 1 is always before the catalytic converter and Sensor 2 is always after the catalytic converter.
If you have a 3.4 liter V-6 the #1 cylinder is on the passenger side. If you have the 4.7 liter V-8 the #1 cylinder is on the drivers side.
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SOURCE: Where is O2 sensor circut bank1 sensor 2. And bank
Bank 2, sensor 2 is at the bottom of the engine as you look in from the bumper. It is installed in the exhaust pipe just below the catalytic converter. The bank 1, sensor 2 is at the same location on the back of the engine below the firewall.
See pictures below
SOURCE: i know where the sensor 2 is but where is the bank
For 1999 Subaru Truck Forester AWD 2.5L MFI 4cyl the Oxygen Sensor is located under hood, center, rear engine area, mounted on catalytic converter.
Fig. Oxygen sensor location-Forester 1998-2002 2.5L SOHC engine (click over image for zoom).
Generally, Bank 1 is front and Bank 2 is rear.
Hope helps.
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