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Old 06-11-2012, 03:38 PM   #18
sdbimmer
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Join Date: Aug 2003
Location: San Diego
Posts: 561
My Ride: 2004 325Ci
#2 is (Bank 2, Sensor 1) and for your car it is a little shorter than the sensor in the front. they are basically the same sensor. If the shop doesn't have #2, you can probably just buy #1 to put into #2 position. That's probably the reason why the shops are telling you both answers.
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