Mercury Mariner RSS sensor not activating during reverse on Mercury Mariner

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mercury Mariner owners report experiencing issues with the Rear Sensing System (RSS) sensor not activating during reverse. These problems can occur if the RSS sensors on the rear bumper are obstructed by snow, ice, or dirt, which can affect their functionality. Additionally, some owners find that if there are objects within the detectable range of the sensors, typically 6 feet behind the vehicle, the system may not activate properly. Cleaning the sensors with a dry shop towel or washing them to remove contamination is recommended, as improper cleaning methods could hinder their accuracy. If these troubleshooting steps do not resolve the activation issue, further diagnostics or professional assistance may be required to effectively address the problem.

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