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Old 09-02-2012, 01:09 PM   #16
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,574
My Ride: 330CiC, M5, X5
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?
Solve your misfires, lean codes, rough idle -

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