Mercury Mountaineer brake sensor malfunction causing shift lock and brake light issues on Mercury Mountaineer

Submitted by user85021 · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mercury Mountaineer owners report experiencing issues related to brake sensor malfunctions, which can lead to shift lock problems and brake light failures. These owners have noted that a malfunctioning brake sensor may affect the shift lock mechanism, making it difficult to shift gears or release the shift lock. Additionally, problems with the brake lights can occur, such as the lights not illuminating correctly or remaining on continuously when the brakes are not engaged. These malfunctioning sensors can pose safety risks by compromising the functionality of critical systems. It is essential for owners experiencing these issues to have the brake sensor inspected and repaired by a qualified mechanic to ensure safe driving conditions.

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