U3121

U3121 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3121 Diagnosis

The fault remains active until the ignition is turned ON when the fault is no longer present. Some BHM configurations force this circuit off until the ignition switch is cycled.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.

A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Barometric pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported.

Ford U3121 Fault Code Meaning :

Ford U3121 Symptoms :

Ford U3121 Reasons :

How To Fix Ford U3121 Trouble Code ?

Which Ford cars have the code U3121?

  • U3121 Ford Aerostar
  • U3121 Ford Bronco
  • U3121 Ford C-Max
  • U3121 Ford C-Max Energi
  • U3121 Ford C-Max Hybrid
  • U3121 Ford Contour
  • U3121 Ford Crown Victoria
  • U3121 Ford EcoSport
  • U3121 Ford Econoline
  • U3121 Ford Edge
  • U3121 Ford Escape
  • U3121 Ford Escape Hybrid
  • U3121 Ford Escort
  • U3121 Ford Everest
  • U3121 Ford Excursion
  • U3121 Ford Expedition
  • U3121 Ford Explorer
  • U3121 Ford Explorer Sport Trac
  • U3121 Ford F-150
  • U3121 Ford F-250
  • U3121 Ford F-350
  • U3121 Ford Fiesta
  • U3121 Ford Flex
  • U3121 Ford Focus
  • U3121 Ford Focus Electric
  • U3121 Ford Freestar
  • U3121 Ford Freestyle
  • U3121 Ford Fusion
  • U3121 Ford Fusion Energi
  • U3121 Ford Fusion Hybrid
  • U3121 Ford Fusion Plug-In Hybrid
  • U3121 Ford GT
  • U3121 Ford Mustang
  • U3121 Ford Mustang Mach-E
  • U3121 Ford Mystique
  • U3121 Ford Probe
  • U3121 Ford Ranger
  • U3121 Ford Taurus
  • U3121 Ford Taurus X
  • U3121 Ford Tempo
  • U3121 Ford Thunderbird
  • U3121 Ford Transit
  • U3121 Ford Transit Connect
  • U3121 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.