Warning light kicks on though the reservoir is full. I see the replacement sensor, and assume that one is in the big reservoir. Autohausaz, one source says the X5 may have as many as three. Can anyone share a DIY on replacing the sensor(s), with locations? thanks

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.