I hit a snow bank once and packed the duct full of snow. My ambivert tempo was struck at 28F for quite a while. I tried to get to the sensor and like mentioned can't get to it but I thought I saw you can get to it by removing inner wheel well which should be easier than the bumper. Looking on YouTube I can only find the procedure for sedans

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)