The oxidation bed (pre-cat) then oxidizes, and removes all but around. The upstream o2 sensor is located in the manifold, and it reads A/F based on the oxygen level present in the exhaust.The 1st sensor is located closest to the engine, and the last is located toward the rear of the exhaust system. The one on/at the exhaust manifold should be Bank 1 Sensor 1. So, Bank 1 Sensor 2 should be the one under the car. With a 4 cylinder, everything should be Bank 1 (No Bank 2). Bank 1 Sensor 1 would be upstream of the catalytic converter. Bank 1 Sensor 2 should be the sensor downstream of the catalytic converter.Likewise, the O2 sensor (sensor 2, bank 2) of the car is installed downstream or behind the catalytic converter on the bank, which links to the 1st … Sensor 2 refers to the Oxygen sensor after the. Where is the location of bank 1 sensor 2 on a 2000 Nissan quest? Bank 1 refers to the location of the bank of cylinders that contain the #1 cylinder.
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