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Bank 1 and Bank 2 sensor 1 (upstream) are usually the same. Sometimes the only difference is the length of the wire harness. Same goes for sensor B1 S2 and B2 S2 (downstream). It really depends on the vehicle. Some vehicles call them air/fuel sensors and they are all the same.

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Q: Are bank1 O2 sensors the SAME as bank 2 sensors and the BANK 1 SEN1 or 2 BANK 2 sen1 or 2 DESIGNATIONS?
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