C0421

C0421 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

C0421 Diagnosis

The BHM supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for an open circuit fault.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 C0421 Fault Code Meaning :

Ford C0421 Symptoms :

Ford C0421 Reasons :

How To Fix Ford C0421 Trouble Code ?

Which Ford cars have the code C0421?

  • C0421 Ford Aerostar
  • C0421 Ford Bronco
  • C0421 Ford C-Max
  • C0421 Ford C-Max Energi
  • C0421 Ford C-Max Hybrid
  • C0421 Ford Contour
  • C0421 Ford Crown Victoria
  • C0421 Ford EcoSport
  • C0421 Ford Econoline
  • C0421 Ford Edge
  • C0421 Ford Escape
  • C0421 Ford Escape Hybrid
  • C0421 Ford Escort
  • C0421 Ford Everest
  • C0421 Ford Excursion
  • C0421 Ford Expedition
  • C0421 Ford Explorer
  • C0421 Ford Explorer Sport Trac
  • C0421 Ford F-150
  • C0421 Ford F-250
  • C0421 Ford F-350
  • C0421 Ford Fiesta
  • C0421 Ford Flex
  • C0421 Ford Focus
  • C0421 Ford Focus Electric
  • C0421 Ford Freestar
  • C0421 Ford Freestyle
  • C0421 Ford Fusion
  • C0421 Ford Fusion Energi
  • C0421 Ford Fusion Hybrid
  • C0421 Ford Fusion Plug-In Hybrid
  • C0421 Ford GT
  • C0421 Ford Mustang
  • C0421 Ford Mustang Mach-E
  • C0421 Ford Mystique
  • C0421 Ford Probe
  • C0421 Ford Ranger
  • C0421 Ford Taurus
  • C0421 Ford Taurus X
  • C0421 Ford Tempo
  • C0421 Ford Thunderbird
  • C0421 Ford Transit
  • C0421 Ford Transit Connect
  • C0421 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.