Which engine do you have?
If it Is a six cylinder engine, bank 1 is the one on the left if you look at engine from pulley side.
Sensor 1 is the one on the exhaust manifold, before the catalytic converter.
Jul 4, 2016 at 7:38 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.