I had searched the archives and came up with no real solution, I even posted asking if anyone had come up with one, the reply was a simple no. So, here is what I did:

Bought 2 PSO2SIM's and 2 O2 Sensor Heater Simulating Resistors from Baker Electronics for a total of something like $90.

**BEGIN EDIT** --01/21/06

Just to be clear, the O2 sims + heater sims can be hooked up anywhere along the path of their wires, to help people with this I included both side(ECU/SENSOR) wire colors below. You can truly make a sleeper system by connecting the sims right off the ECU wires, and just removing/disconnecting the rear O2 sensor completely. The O2 sims are water tight and are small enough to fit into most places. The heater sims will need some space to breath, but are also quite small. I will post some pics as soon as I can of my setup.

I won't be making/selling these, sorry all! I will answer questions from those who have them, please post and/or mail me if that doesn't get to me.

**END EDIT**

The install took a lot of time figuring out wire colors, where to cut/soldier, where to place the sims/resistors..etc.. But in the end, it all works great! Here are the wire specs for those who are interested in doing this them selves:

Plugs are layed out the following way:
.____________
|_1____ 234__\
|_o____ ooo__| (ROUNDED SIDE)
|___________/

1 - Sensor Signal
2 - Sensor Ground
3 - Heater Ground
4 - Heater Signal


PASSENGER SIDE

brown plug - REAR O2 sensor side
1 - black
2 - gray
3 - white
4 - white

brown plug - REAR O2 harness side
1 - red
2 - purple
3 - white/yellow
4 - green/yellow

black plug - FRONT O2 sensor side
1 - black
2 - gray
3 -
4 -

black plug - FRONT O2 harness side
1 - white
2 - brown
3 -
4 -


DRIVERS SIDE

green plug - REAR O2 sensor side
1 - black
2 - gray
3 - white
4 - white

green plug - REAR O2 harness side
1 - blue
2 - gray
3 - red/yellow
4 - green/yellow

black plug - FRONT O2 sensor side
1 - black
2 - gray
3 -
4 -

black plug - FRONT O2 harness side
1 - green
2 - yellow
3 -
4 -

Lance
01.5 S4
   98 A4 Avant

REVO | HyperBoost DVs | DTS | Snub | HyperShifter | RO2 Sims
E-Codes | City | Aero | Bi-Pipe | EFK | RNS-E | B7-RS4 Reps
Cold | Premium | Bose | Sport-Trim | X-1
Euro Rear | Eibach Pro Street-S

When Spark Plugs Attack
Rear O2 Sensor Simulator Solution