Don't risk it, especially in a $103,595 super sedan. Once those faulty fuel level sensors are fixed, the M5 will return to its position near the top of the automotive hierarchy of cool.

Dropping the gas tank and replacing part of the sensor would take about half a day. Through June, the 5 Series is BMW's third-best-selling model at 15,846 units sold year-to-date.

The low-level sensor circuit itself is simple: two wires, one to ground, and the other to the Body Control Module. When the coolant level is low, the sensor completes the ground circuit to the BCM.