P421B

P421B Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P421B 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.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 P421B Fault Code Meaning :

Ford P421B Symptoms :

Ford P421B Reasons :

How To Fix Ford P421B Trouble Code ?

Which Ford cars have the code P421B?

  • P421B Ford Aerostar
  • P421B Ford Bronco
  • P421B Ford C-Max
  • P421B Ford C-Max Energi
  • P421B Ford C-Max Hybrid
  • P421B Ford Contour
  • P421B Ford Crown Victoria
  • P421B Ford EcoSport
  • P421B Ford Econoline
  • P421B Ford Edge
  • P421B Ford Escape
  • P421B Ford Escape Hybrid
  • P421B Ford Escort
  • P421B Ford Everest
  • P421B Ford Excursion
  • P421B Ford Expedition
  • P421B Ford Explorer
  • P421B Ford Explorer Sport Trac
  • P421B Ford F-150
  • P421B Ford F-250
  • P421B Ford F-350
  • P421B Ford Fiesta
  • P421B Ford Flex
  • P421B Ford Focus
  • P421B Ford Focus Electric
  • P421B Ford Freestar
  • P421B Ford Freestyle
  • P421B Ford Fusion
  • P421B Ford Fusion Energi
  • P421B Ford Fusion Hybrid
  • P421B Ford Fusion Plug-In Hybrid
  • P421B Ford GT
  • P421B Ford Mustang
  • P421B Ford Mustang Mach-E
  • P421B Ford Mystique
  • P421B Ford Probe
  • P421B Ford Ranger
  • P421B Ford Taurus
  • P421B Ford Taurus X
  • P421B Ford Tempo
  • P421B Ford Thunderbird
  • P421B Ford Transit
  • P421B Ford Transit Connect
  • P421B 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.