U0121

U0121 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U0121 Diagnosis

The CHM does not suupport PWM type DRLs. The vehicle has a BHM mismatch with the CHM. Replace the CHM with one that is compatible with the BHM.The position information for the switch becomes Not Available. Remove the duplicate Smart Switch, then use ServiceLink to verify that the correct Smart Switches are configured for the vehicle.

Engine starting is disabled and other optional functions may be interrupted until the fault is corrected and the ignition switch is cycled.

Ford U0121 Fault Code Meaning :

Ford U0121 Symptoms :

Ford U0121 Reasons :

How To Fix Ford U0121 Trouble Code ?

Which Ford cars have the code U0121?

  • U0121 Ford Aerostar
  • U0121 Ford Bronco
  • U0121 Ford C-Max
  • U0121 Ford C-Max Energi
  • U0121 Ford C-Max Hybrid
  • U0121 Ford Contour
  • U0121 Ford Crown Victoria
  • U0121 Ford EcoSport
  • U0121 Ford Econoline
  • U0121 Ford Edge
  • U0121 Ford Escape
  • U0121 Ford Escape Hybrid
  • U0121 Ford Escort
  • U0121 Ford Everest
  • U0121 Ford Excursion
  • U0121 Ford Expedition
  • U0121 Ford Explorer
  • U0121 Ford Explorer Sport Trac
  • U0121 Ford F-150
  • U0121 Ford F-250
  • U0121 Ford F-350
  • U0121 Ford Fiesta
  • U0121 Ford Flex
  • U0121 Ford Focus
  • U0121 Ford Focus Electric
  • U0121 Ford Freestar
  • U0121 Ford Freestyle
  • U0121 Ford Fusion
  • U0121 Ford Fusion Energi
  • U0121 Ford Fusion Hybrid
  • U0121 Ford Fusion Plug-In Hybrid
  • U0121 Ford GT
  • U0121 Ford Mustang
  • U0121 Ford Mustang Mach-E
  • U0121 Ford Mystique
  • U0121 Ford Probe
  • U0121 Ford Ranger
  • U0121 Ford Taurus
  • U0121 Ford Taurus X
  • U0121 Ford Tempo
  • U0121 Ford Thunderbird
  • U0121 Ford Transit
  • U0121 Ford Transit Connect
  • U0121 Ford Windstar

A code is a fault code and it indicates that something has gone wrong with your car's engine.

It can be caused by many different problems, including a faulty battery, a bad fuel pump, or even a cracked exhaust manifold.

You will need to diagnose the problem before you can fix it. The best way to do this is with an OBD scanner tool.

A scan tool will tell you what needs fixing and how much it will cost in order to fix that particular issue.