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Old 06-15-2009, 06:11 PM   #1
bmwmedic
Registered User
 
Join Date: Feb 2008
Location: Ft Worth TX
Posts: 141
My Ride: 323i 99 01 530i sp
Help! which O2 sensors? bosch but?# of wires?

Looking at ads for aftermarket O2 sensors, Some have good sales today for fathers day,but they often list multiple choices., even by Bosch. I have learned that part of the difference is whether
the sensor comes with a BMW electrical fitting. I am happy to splice the old fitting to save
$40-60 x4.
But they ask two wire, three wire or four?
Does anybody know the difference? Are post and pre cat the same?
I have e39 01 and a 99 323, basically the m52tu and m54, same as a 330i.
Anybody know the big picture on these??
Or just where to get best price?
thanks
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