I accidently cut my o2 wires during the stall install. There are 2 brown wires, a purple, and a tan. How do I tell which brown wire is which?

 

It should not matter, but if they are cut on the O2 side of the connector, you might as well throw them away and buy new ones. The operation of the sensor will be compromised and may not work correctly. The sensor uses the wires to draw in reference air as part of it's operation. If the wire and insulation are compromised or altered, improper operation may result.

 

Shoebox is absolutely correct. They will not read right unless by chance you get the right one spliced back together, but you're better off pitching them.

 

Well, I spliced them back together and the car is running fine. So far I guess I'm lucky.

 

It will run, but that doesn't mean that they're reading right though. Hopefully you got it though.