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Q:Is this the correct replacement for bank one oxygen sensor.
A:This is an upstream sensor which is before catalytic converter.
Q:is this 02 sensor down stream or up stream?
A:It is the upstream oxygen sensor.
A:According to the part description, this sensor is "pre-cat" which means "pre/before the catalytic converter". This analogy would indicates that the placement is "Up Stream" from the catalytic converter.