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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-09-2014, 03:28 PM   #1
Registered User
Join Date: Sep 2009
Location: Hickory, NC
Posts: 219
My Ride: 328Ci
New "Smart" O2 Sims

Just bought the new Smart O2 Sims from o2simulator.com

I had originally purchased one of the regular dual output sims from them and was not pleased with my results. The original sim was only producing the correct voltage on B1S2 and not B2S2. After a few emails he told me he would refund my purchase and give me a discount on their new "smart" sims.

As you guys know it is hard to trust someone when their product didn't work and they want to try and upsell you on a new product. They told me they would refund me my entire purchase with them if their new product didn't work.

So...after extensive data logging and needing to get that annoying CEL light off the track car I decided I would try it out. Here is the setup. No pictures...if you really need pictures you shouldn't be cutting and soldering (or lack there of) your wiring harness in the first place.

These smart sensors DO have wideband connectivity if you are interested.
BMW uses Zirconia type O2 sensors if you have OEM.

Here is the test subject:

2000 BMW 328Ci M52TU with Dinan Tune

Using connector X60002 leading into the DME the wiring setup used is as follows:

No.1 Sim:

Splice Blue wire to B1S1 SIG - Pin 14 - Yellow (GE)
Splice Green wire to B1S1 GND - Pin 20 - Black (SW)
Connect Brown wire to B1S2 SIG - Pin 16 - Yellow (GE) Cut this wire
Splice Grey wire to B1S2 GND - Pin 22 - Black (SW)

No.2 Sim:

Splice Blue wire to B2S1 SIG - Pin 15 - Yellow (GE)
Splice Green wire to B2S1 GND - Pin 21 - Black (SW)
Connect Brown wire to B2S2 SIG - Pin 18 - Yellow (GE) Cut this wire
Splice Grey wire to B2S2 GND - Pin 24 - Black (SW)

The signal wires coming from the DME for the post-cat sensors needs to be connected to the Brown wire so it can output its signal from the sims.

Power was connected to IGN on 12v
Ground was connected to chassis ground

Data logging verifies sims are properly switching voltages and all intrusive tests that the DME performs when cutting fuel are now compensated by the "smart" sims.

The readiness monitors show that the sims are working properly and they have completed their checks.

Make sure you correctly cover any exposed wires and stash your new sims in a cool dry place.

Evil 328Ci:
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Old 02-09-2014, 03:48 PM   #2
Registered User
Join Date: Jun 2012
Location: Chicago
Posts: 145
My Ride: e46M3
Nice, well written. Just curious if it work with another model such as e46m3
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Old 02-11-2014, 12:38 AM   #3
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Join Date: Sep 2009
Location: Hickory, NC
Posts: 219
My Ride: 328Ci
Yes. You would need the wiring diagram for the specific harness. Have a bentley manual? If not PM me.
Evil 328Ci:
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