My O2's are shot so I went to replace them with new bosch ones. Heres why things didnt work. About a month ago I extended the wiring to they worked with my LTs and when I changed the O2s last night I just cut the wires near the header and then reconnected everything but the wires were different colors. The stock ones are 2 purples, black (or brown) and a light brown. The bosch ones are 2 whites, grey and black. Anyone know which one would go where? Do the wires on into the O2 on the bosch one the same they do on the stock one?

Hopefully that made sense and someone could give me some information so I can fix this and get rid of my check engine light.

 

If you want your car to run right, you need to buy extensions and AC DELCO o2s. But that's my opinion.

As for reconnecting wires, reconnect them in the same order they were connected before you cut them.