i need a o2 sensor for my car(91 civic Si) and it has a ZC SOHC swap well i need to find out what o2 sensor i need cuz i know theres a 1 wire, 2 wire, 4 wire? i have already tried a 1 wire and it didnt fit or work at all! my car is obd0 just 2 let yu know! anyone know what sensor i need and off what car i need to get it from?