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Hey Guyz I have a E46 320i which has being smoking at 6000rpm (only @ 6000rpm and above) i took it to a BMW electrictrician who checked up on the BMW computer box and it came up with 3 faults, 1 on the airflow meter and 2 on the exhaust we then reset the faults retested and only the fault on the exhaust sensor came up i now need to clean the exhaust sensor that is in front of the engine. Any idea on how to take the sensor out? He also advised me to take out the cats, did any of you do this and was there a major change in power or fuel consumtion?