There are 2 owner-reported fuel system complaints for the 2009 Lincoln MKSin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2009 LINCOLN MKS. WHILE DRIVING AT VARIOUS SPEEDS, A LOUD WHISTLING NOISE EMITTED FROM THE VEHICLE. THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS DIAGNOSED THAT THE FUEL PUMP NEEDED TO BE REDESIGNED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 182,000.
A/C CONDENSER AND TRANSMISSION UNIT. A FREON LEAK IN THIS UNIT CAN DUMP FREON GAS AND COMPRESSOR OIL INTO THE TRANSMISSION WHICH CAN CAUSE TRANS PROBLEMS OR TRANSMISSION FLUID CAN LEAK INTO THE A/C SYSTEM AND RUIN ALL COMPONENTS IN THE SYSTEM. THIS CAN BE A VERY EXPENSIVE REPAIR OR THE CAR IS JUNK. TRANS COOLER SHOULD BE A SEPARATE UNIT TO PREVENT THIS PROBLEM.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026