P421A

P421A Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P421A 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.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

The BHM measures the current on this circuit when the starter output is commanded ON. This fault indicates the magnetic switch or the wiring between the BHM and the magnetic switch is open circuit.

Ford P421A Fault Code Meaning :

Ford P421A Symptoms :

Ford P421A Reasons :

How To Fix Ford P421A Trouble Code ?

Which Ford cars have the code P421A?

  • P421A Ford Aerostar
  • P421A Ford Bronco
  • P421A Ford C-Max
  • P421A Ford C-Max Energi
  • P421A Ford C-Max Hybrid
  • P421A Ford Contour
  • P421A Ford Crown Victoria
  • P421A Ford EcoSport
  • P421A Ford Econoline
  • P421A Ford Edge
  • P421A Ford Escape
  • P421A Ford Escape Hybrid
  • P421A Ford Escort
  • P421A Ford Everest
  • P421A Ford Excursion
  • P421A Ford Expedition
  • P421A Ford Explorer
  • P421A Ford Explorer Sport Trac
  • P421A Ford F-150
  • P421A Ford F-250
  • P421A Ford F-350
  • P421A Ford Fiesta
  • P421A Ford Flex
  • P421A Ford Focus
  • P421A Ford Focus Electric
  • P421A Ford Freestar
  • P421A Ford Freestyle
  • P421A Ford Fusion
  • P421A Ford Fusion Energi
  • P421A Ford Fusion Hybrid
  • P421A Ford Fusion Plug-In Hybrid
  • P421A Ford GT
  • P421A Ford Mustang
  • P421A Ford Mustang Mach-E
  • P421A Ford Mystique
  • P421A Ford Probe
  • P421A Ford Ranger
  • P421A Ford Taurus
  • P421A Ford Taurus X
  • P421A Ford Tempo
  • P421A Ford Thunderbird
  • P421A Ford Transit
  • P421A Ford Transit Connect
  • P421A 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.