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Old 02-02-2013, 06:13 PM   #4
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Join Date: Jun 2010
Location: CT
Posts: 2,128
My Ride: 2001 325i
Not knowing more information about your friends Z3 and your 318i I can't tell if the parts are the same or not. However, there are 4 pin and 5 pin O2 sensors in use. I want to say the 5th pin is for pre-heating the O2 sensor, if memory serves correctly.
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