The car's fuel gauge will suddenly drop to empty and the car will run out of fuel. by doing some research this is a very common problem with ford flex and it is very dangerous. this has happened multiple times and the most recent was this weekend when my wife was driving on the interstate and it died in traffic. very dangerous
Sudden acceleration requiring braking and downshift of automatic transmission to avoid collision. has happened on highway and in stopped traffic. latest episode this past week.
Exhaust in passenger cabin, enough to make you light headed and start coughing, mainly happens with air conditioning turned on, under hard accelerations. dealer can not reproduce or find any problems.
Eco boost engine stall due to condensation of air from the cold air compressor in the turbo charger for the engine. have had car serviced several times and dealer or mechanic can not resolve problem. happen in freeway at high speed but has also happened in the street at 20 - 30 mph