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      11-13-2012, 09:14 PM   #16
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Drives: E92 335i, F30 328i, F82 M4
Join Date: Dec 2007
Location: Hudson, MA

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Gray o2 sensors go on the short (passenger side) and black sensors go on the long (driver side) pipes. Almost any front o2 code involves incorrectly installed o2 sensors
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