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Old 09-02-2012, 12:09 PM   #16
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 8,497
My Ride: '06 330CiC, '03 M5
Check fuses first, many of the O2 heater circuits have individual fuses.

If the heaters have individual fuses, you may be able to just pull a fuse to narrow down which O2 sensor is which?
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