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2AC2: O2 sensor (bank, sensor 1) mixture too lean.
What symptoms are you experiencing? Does it hesitate when you accelerate? How many miles are on your R56? Any other lights on the dash? Did you replace the o2 sensor?
I have seen this code before with a bad cat, but there were a few other codes as well as an ECL light & loss of acceleration when stepping on the accelerator. Replaced that, along with both sensors and new spark plugs and all was resolved.
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