Question - Why buddy has his '01 integra converted to OBD1 from OBD2. His 02 sensor went out. Obviously he's only using one 02 sensor and I'm 99% sure it's the one in front but my question is this - Does he use an o2 sensor from an OBD1 integra or one from an OBD2 integra? I'm trying to get him a new one from my work but I can't tell if there is a difference between OBD1 and 2 02 sensors. My computer lists a different part number but they physically look the same. Can someone help us out?