I am reminded of a friend who changed his steering wheel plastic trim, in the process he bumped the wheel position sensor out of calibration. No worries, trigger a recalibration. Uh oh, won't recalibrate.

This of course meant the entire cars safety and stability control systems, ABS and traction control were all disabled. It drove like a tank.

The fix, obviously, was to replace the brake booster primer pump (hybrid car). It had worn enough to no longer recalibrate. Still perfectly functional, and would have kept working for a long time, bit it wouldn't quite meet the factory expected parameters so it failed it's test.