[Doubledip]

There are heaps of different O2 sensors round... otherwise when you would go to buy them they would just ask how many wires and thats it... so you will need the correct one for the ECU in question. They are calibrated for it specifically.

Also why are you going to grab secondhand wrecker jobs????? get some new ones as they are not that expensive and 99% of the time the wreckers ones will be F$#%$%# because they have been sitting outside corroding.

If you were to get secondhand ones that are faulty then your car may run super rich or lean and could hurt the engine or you will end up complaining that you are using alot of fuel... why skimp on these things, i am sure that you havent skimped on the rest of the car?

just my 2 cents worth.