Wow! In cold weather, my air pump sound like a F14 waiting to take off. Not being a super critical component, I ordered one from RockAuto.com. It set a code, went to another different brand and it set a code too. Finally went with their Hella and most expensive air pump. No codes or noises. Both first and second returns went without a hitch. I've been happy with purchases from them.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)