how do you wire up a 4 wire o2 sensor
Ok i finally got another o2 sensor. This new sensor has a purple, white, grey, and black wire. The original sensor has 2 black wires, 1 blue and 1 white. What wire goes where? it did not come with instructions.
Also i scanned the dtcs before i did anything and catalyst effeciecy bank 1 was found, i believe the code was p0420. What does this mean? The threads on the bank 1 downstream sensor i'm changing got messed up when i was pulling it out. I was able to file down some of the threads and put it back in tight but after a few miles of driving my CEL came on. I'm just curious because my Gas mileage has dropped a little.
Last edited by badblackram06; 05-11-2010 at 01:45 PM.