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Old 02-15-2005, 06:07 PM
vm vm is offline
Officially Welcomed to the 'Fest
Location: Pittsburgh, PA
 
Join Date: Jul 2002
Posts: 150
Mein Auto: 330i
I didn't know that Siemens made O2 sensors and couldnt find them on Siemens website. I have always assumed that they were Bosch. Not directly related to your question but just to tell you that the only function of the after cat sensors is checking on the status of the Cats and nothing else. They will not help with mixture, fuel economy, etc. so it might be a waste of money to try to change them before they are broken or before the 100k service date.
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