During one of my routine brake pad changes, I wound up with a flickering sensor light after completing the task. Turned out that I had managed to get the sensor wire caught under the hold-down clip on one side, and bare wire had made contact.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car