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P0573 - Brake Switch A Circuit High

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0573 - BRAKE SWITCH A CIRCUIT HIGH

Description:  This DTC indicates the brake switch is stuck in the OFF position.
Possible Causes: 
  • Open or short in the BPP circuit
  • Open or short in the stoplamp circuits
  • Damaged brake switch
  • Misadjusted brake switch
Diagnostic Aids:  Using the scan tool, check the BOO PID. The BOO PID should toggle on and off with brake pedal activation.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST FD .
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