Mercury Mariner owners have reported 1 problem related to transmission slip out of gear (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Mariner based on all problems reported for the Mariner.
The vehicle had been driving perfectly normal all day. In the evening, while driving in a heavily-trafficked area, unexpectedly our Mariner would not shift out of 1st gear - the engine revved, but the car would just barely move. It finally shifted into 3rd gear, but never would go into 4th. All the while, the o/d light on the instrument panel was going on and off. This pattern continued for several days while we had our Mariner inspected at numerous repair shops; the end result was that we had to have the transmission rebuilt at a cost of $1700. At only 111,000 miles! all of the transmission repair shops that we talked with stated that this is a common occurrence in this year-model Ford product, many times was far less mileage than ours had.
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