G'day everyone, I am replacing the 02 sensor on the wife's car which is a 98 corolla seca hatch the sensor I bought is a universal one, and I need to join the 2 signal wires together. The wires on the car, one is blue and the other is white, so one of the wires goes to the ecu and the other is the earth, can you tell me which wire is which? I have looked in the manual but there is no info on it. Have also done a bit of a search but couldn't find anything. Thanks for your help cheers whiskers