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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-13-2016, 10:11 PM
Packrat555 Packrat555 is offline
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Location: Texas
Join Date: Jul 2009
Posts: 9
Mein Auto: 2001 325i
working o2 simulator 540i

wanted to share an o2 simulator that is working on my 2003 540i.

cats are gutted and I tried several simple solutions like defoulers and capacitor circuits without success. after searching the boards for months recently found someone in canada ( with a product that was supposedly a new better circuit and they reported success on a bmw N55.

wired them in at the ecu and after a drive cycle has no pending codes and IM ready for catalyst. I have driven 200 miles and now have 0 INC ready to pass inspection. They are very small about the size of a matchbox and there is plenty of room in the ecu compartment.

a little confusing trying to identify which wires to cut. in the end I ohmed out from the o2 sensor to verify I was correct.

The o2 sensors go to the the 24 pin connector on the ecu. Each sensor wires are grouped. On my US model it is:

Black/Blue wire bank 1 behind the cat
Black/White wire bank 2 behind the cat
(see drawings and confirm your exact model)

first picture shows the cables entering the ecu compartment. cut the signal wire and splice in the sensor as directed yellow wire on the ecu side.

I grabbed power and ground tapping into the big red and black wire on the connector. probablly should have added an inline fuse but used very thin wire so hopefully it will burn open in the unlikely event the simulator shorts out.

picture 2 shows both sensors taped together the fit nicely next to the relays held with tape and a cable tie.
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Old 04-13-2016, 10:20 PM
ca2014mp2 ca2014mp2 is offline
Officially Welcomed to the 'Fest
Location: San Jose
Join Date: Jul 2014
Posts: 2,839
Mein Auto: E39 2000 528ITA
how about a wiring diagram on what you did..
Series E39 Vehicle code DP63 Model 528ITA Engine M52TU
Body type OTHER Catalog model USA Production date 1999 / 06
Transmission Automatic Steering Left Catalyzer YES

Production FROM : 1998/09/01 TO : 1999/08/31
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