Recently i upgraded my headers with DC sport, and Invidia Cat back exhaust. i also put in flowmaster cat... after a month or two CEL n ATTS came on.... i changed the cat to an OEM but right after a week light came back on...i bought O2 simulator n i cant find the specs... i need the wires color codes.. i have no clu. i think o2 sensor after cat has four wires n i dont know which one is which... i know for sure i have 2 white wires, one grey and blk..... i need some help installing this simulator....

 

Why don't you get a new 02 sensor? A Bosch universal is around $50...

You also might want to mention some details about the 'simulator' so someone can help you.

 

i recently put in new after cat o2 but still reading the same code(Po420 low efficiency cat something like that).... i jst colord match the o2 wires with factory socket.... i cud be wrong there.... how can i identify which color is for ground, power, heater, and i dont know the last color spec.....total 4 wires......

 

Sometimes the codes that you throw have nothing to do with what the actual problem is. I.E. you throw a O2 code because your runing overly rich or lean, not beacause the O2 sensor is bad.

WIth the wiring, figuring out the positive and negative wires should beeasy. Whatever wires spark theres your + and -. Then stick both wires to a ground, what ever one arks is your positive. Then you have a 50/50 chance of getting the other wires right.

One more thing about the 02 sensor is, those wires are very picky. IF they are soldiered wrong they will send a bad signal to the ecu. Those wires mesasure resistance in the wires. To much or to little will set off alarms and the fuel injectors will run on an open circute just dumping Fuel into the motor.

In my experience With O2 codes, YOu have to think outside the box