P3421

P3421 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3421 Diagnosis

This fault indicates that the circuit is drawing more current than it is designed to supply, and possibly there is a wiring fault shorting this circuit to ground. The fault remains active until the ignition is turned ON when the fault is no longer present.The BHM is detecting more than one smart switch with the same ID number present on the vehicle. The outputs controlled by the switch and the indicator in the switch are commanded FF.

The End of Frame air output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for an End of Frame air solenoid fault, and for an air pressure switch short circuit fault.

Ford P3421 Fault Code Meaning :

Ford P3421 Symptoms :

Ford P3421 Reasons :

How To Fix Ford P3421 Trouble Code ?

Which Ford cars have the code P3421?

  • P3421 Ford Aerostar
  • P3421 Ford Bronco
  • P3421 Ford C-Max
  • P3421 Ford C-Max Energi
  • P3421 Ford C-Max Hybrid
  • P3421 Ford Contour
  • P3421 Ford Crown Victoria
  • P3421 Ford EcoSport
  • P3421 Ford Econoline
  • P3421 Ford Edge
  • P3421 Ford Escape
  • P3421 Ford Escape Hybrid
  • P3421 Ford Escort
  • P3421 Ford Everest
  • P3421 Ford Excursion
  • P3421 Ford Expedition
  • P3421 Ford Explorer
  • P3421 Ford Explorer Sport Trac
  • P3421 Ford F-150
  • P3421 Ford F-250
  • P3421 Ford F-350
  • P3421 Ford Fiesta
  • P3421 Ford Flex
  • P3421 Ford Focus
  • P3421 Ford Focus Electric
  • P3421 Ford Freestar
  • P3421 Ford Freestyle
  • P3421 Ford Fusion
  • P3421 Ford Fusion Energi
  • P3421 Ford Fusion Hybrid
  • P3421 Ford Fusion Plug-In Hybrid
  • P3421 Ford GT
  • P3421 Ford Mustang
  • P3421 Ford Mustang Mach-E
  • P3421 Ford Mystique
  • P3421 Ford Probe
  • P3421 Ford Ranger
  • P3421 Ford Taurus
  • P3421 Ford Taurus X
  • P3421 Ford Tempo
  • P3421 Ford Thunderbird
  • P3421 Ford Transit
  • P3421 Ford Transit Connect
  • P3421 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.