P421F

P421F Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P421F Diagnosis

The PTO 1 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for PTO 2 air solenoid fault, and for air pressure switch short circuit fault.The BHM supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for a wiring fault shorting this circuit to ground or for too many optional circuits spliced into it that is causing the BHM to turn it off.

When the engine is in higher engine speed and torque condition, the differential pressure over the DPF is expected to rise according to engine speed and torque. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford P421F Fault Code Meaning :

Ford P421F Symptoms :

Ford P421F Reasons :

How To Fix Ford P421F Trouble Code ?

Which Ford cars have the code P421F?

  • P421F Ford Aerostar
  • P421F Ford Bronco
  • P421F Ford C-Max
  • P421F Ford C-Max Energi
  • P421F Ford C-Max Hybrid
  • P421F Ford Contour
  • P421F Ford Crown Victoria
  • P421F Ford EcoSport
  • P421F Ford Econoline
  • P421F Ford Edge
  • P421F Ford Escape
  • P421F Ford Escape Hybrid
  • P421F Ford Escort
  • P421F Ford Everest
  • P421F Ford Excursion
  • P421F Ford Expedition
  • P421F Ford Explorer
  • P421F Ford Explorer Sport Trac
  • P421F Ford F-150
  • P421F Ford F-250
  • P421F Ford F-350
  • P421F Ford Fiesta
  • P421F Ford Flex
  • P421F Ford Focus
  • P421F Ford Focus Electric
  • P421F Ford Freestar
  • P421F Ford Freestyle
  • P421F Ford Fusion
  • P421F Ford Fusion Energi
  • P421F Ford Fusion Hybrid
  • P421F Ford Fusion Plug-In Hybrid
  • P421F Ford GT
  • P421F Ford Mustang
  • P421F Ford Mustang Mach-E
  • P421F Ford Mystique
  • P421F Ford Probe
  • P421F Ford Ranger
  • P421F Ford Taurus
  • P421F Ford Taurus X
  • P421F Ford Tempo
  • P421F Ford Thunderbird
  • P421F Ford Transit
  • P421F Ford Transit Connect
  • P421F 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.