A garage door sensor typically lasts a very long time under normal indoor garage conditions, often between 10 to 15 years, and sometimes even 20 years if it is kept clean and dry. Unlike moving parts like springs or rollers that wear out from friction, safety sensors have no moving parts and are solid-state electronics, so they do not wear out mechanically. Their lifespan is determined more by environmental factors and electrical events. The most common things that shorten their life are moisture intrusion, because they are mounted just a few inches above the concrete floor where water, snow melt, and car wash runoff can seep into the housing and corrode the circuit board. Power surges and lightning strikes can also fry the low-voltage board or the opener's logic board that powers them. Physical damage from being hit by a car bumper, lawnmower, or bicycle is another frequent killer. Direct prolonged exposure to harsh sunlight can degrade the plastic lens and overheat the sensor. If your garage is clean, dry, and the sensors are not bumped, they will often last as long as the opener itself. When one fails, it is best to replace both as a matched pair.
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