[vw97]

First of all, thanks for your response. Unfortunately, I believe you are correct about the cats. After looking at the OEM prices compared to the after market ones that I have, I suspect that they are not properly tuned for this engine. Also, I miss quoting the name of the cats that I had installed…they are Magna Flows (~$150 each). I thought that they were a pretty reputable brand for high performance, but maybe not for BMWs. I’ll go ahead and check the voltages like you suggested and see what they are reading. Not sure if you read in my first thread that I had already replaced the O2 sensors (all four), but got the same performance.

I also got some O2 readings earlier, but they were taken with the O2 out of the circuit…
The heater circuit is reading ~12VDC as expected and the O2 control circuit was reading around 0.18, I probably need to make this measurement again, with O2 in the circuit.

Nevertheless, my engine diagnostic tool, O2 Test indicates that the new O2 sensors are not functioning. It indicates that they are flat dead at 0.0VDC. The mechanic at the European shop read the same. I not sure if the tools are testing them properly either. However, when I reviewed the snapshot data from the tool, it shows a reasonable voltage for the sensors...they changed as expected when the engine RPMs changed. I’ve just about run out of ideas.

Oh, the mechanic says that he don't believe the ECM is degraded either. He said that he has never replaced one on a BMW before.

I will definitely try and manually read the voltages again as you suggested, but it’s starting to look like I going to have to take it to the BMW dealer …Ouch!!! I’ll let you know the new measurements indicate soon.