Nokian snow tires went on last week before we got the snow and single digit temps here in Detroit.

have been having a random code that I can clear and then shows back up weeks or months later AE Cat Efficenct Bank 2 along with a pre cat bank 2
post cat sensor was reading way low most of the time and doing strange stuff looking at data so thought it was time to replace it. Well, got an exhaust leak at the flange and since the O2 is right at the flange it was probably sucking in air causing the really lean I was seeing(0.07V) if we ever get warm again I might slop some RTV on it so I can get to warmer weather in the spring.

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2004 X5(E53) 3.0L
1999 M3(E36)
2003 Z4(E85) 3.0L