hmmm, are most 02's wired up the same way? i got three 4 wire 02's for free from that one wrecking yard, two of them VAG part #'s (0 280 002794/795) on them. they both have two white wires and then one black and one gray. where or how exactly should these be hooked up? or do you know where i could find out? they both look like new, obviously from wrecks, so i'm too worried about using them, it's gotta be better than the stock 3 wire i had in there.