Ok, I decided to make a collaboration of a few different DIY threads and advice I got along the way and make one final easy DIY thread.
Things needed
Wideband ECU
Solder (60/40) & soldering iron
New o2 harness
Wideband o2 sensor
wire & wire cutters
heat shrink tubing
15ohm 25 watt resistor and ECU pin
picks and various other tools such as a 7/8 wrench for the o2 sensors
First you will need your new o2 harness. You can order these from a VW or Audi dealer. Part number 1J0-973-733 If you are cool to the guy working he will probably put the pins in for you and you will end up with something like the pic below and cost around $15. You will also need another pin that you will have to insert into your ecu harness for VVT (pin 115). For this I suggest taking your ecu to the dealer with you and ask them for the correct size pin just to make sure.
Your new o2 harness 1J0-973-733
Your new pin for VVT (ecu pin#115)
Now with your newly acquired pin and harness in hand locate the existing o2 harness. You will see 4 wires coming from that which are conveniently all used in your new harness.
Existing 4 pin o2 harness
From here get your soldering iron plugged in and make sure to have shrink tubing and a heat gun to re-insulate your wires.
Your new wires will go as such
Existing harness New harness
Pin#1 goes to Pin#3
Pin#2 goes to Pin#4
Pin#3 goes to Pin#5
Pin#4 goes to Pin#1
(wire colors vary from some years and ecu but the pin out remains the same from the research I have done)
Now you will have two wires left for your new o2 harness. You will then need to run the two new wires from the ecu harness. I used 22gauge strand wire and 60/40 solder.
Pin 52 on ecu harness goes to Pin#6 on your new harness (there are two harnesses to the ecu, you need the larger side harness)
Pin 71 on ecu harness goes to Pin#2 (same harness directly above pin 52)
To disassemble your ecu harness look for the purple clips on either side.
Use your pick and pull the clips out.
Then pull the rubber orange seal out
From here look for the tabs on back of the harness and pull the back off
Now you will see another purple clip, pull that straight out.
From here, gently pull out the two wire harnesses and add in your new wires (pins are there already and if you look very closely you can see tabs that will bend over and hold the wire in place. (no soldering necessary here, enter wires in through the orange seal)
Once you have your two new wires in and soldered into place, reassemble the ecu harness and move on to the VVT resistor.
The resistor I used was a 15ohm, 25 watt resistor
Now for the VVT you will use the other smaller ecu harness and pin 115 shown here
This side disassembles the same way as the other with the purple pins. Once disassembled, you will use your pic and push a small rubber grommet that is lodged into the pin 115 spot out and proceed to insert you new pin into this spot. It should "click" into place when it is in the correct orientation.
Use your pick and make a hole in the rubber grommet so you can thread your new wire in threw it.
Soldered one end of the resistor to the wire from pin 115 you added, and the other end of the resistor into the evap solenoid harness at pin#1.
Once you have all this done, clean everything up, zip tie your wires out of the way of anything hot, I relocated my evap solenoid under my rain tray and wrapped all the wires together with electric tape and plastic tubing for a clean look. Now you can plug in your new o2 sensor and ecu and enjoy your new MAfless file.
If there is anything in particular you would like a pic of just ask and I will see what I can do. As for pics of actual soldering, well I figure if you can not handle soldering on your own you should not be attempting this to start. Good luck and enjoy.
Modified by jwalker1.8 at 9:07 AM 2-8-2010
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Originally Posted by RENOxDECEPTION
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