Where is the bank 1 sensor 1 O2 sensor located on a 2000 Honda Civic DX?

their just numbered, and theres two..i think..better check everyone should have a manual for their vehicle, and the library should have a professional shop manual available in the reference section for FREE to make copies of...read up and fix like a pro!! :) Dave That car has a 4 cylinder engine, so there is no bank #2 on the car. It only states bank #1, because that is a formality of the terminology required by federal emmissions law. On that car bank 1, sensor 1 would be the oxygen sensor closest to the engine. It could be in the exaust manifold, or just after it. The bank 1 sensor 2 would be the one further down the exaust system, just after the catalytic convertor.