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      04-24-2013, 09:42 AM   #4
Fen335i's Avatar
Drives: e92 M3 / Z4 M Roadster
Join Date: Jun 2008
Location: Pacific Northwest

Posts: 783
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I've replaced the bank 2 pre-cat O2 sensor and did NOT need to drop the exhaust. You do need to remove the metal protection shield that's blocking your access to the 02 sensors however. That's easy though...10 bolts or so and it's off and you will be able to see both pre-cat 02 sensors just after the headers.
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