P4F21

P4F21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P4F21 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 P4F21 Fault Code Meaning :

Ford P4F21 Symptoms :

Ford P4F21 Reasons :

How To Fix Ford P4F21 Trouble Code ?

Which Ford cars have the code P4F21?

  • P4F21 Ford Aerostar
  • P4F21 Ford Bronco
  • P4F21 Ford C-Max
  • P4F21 Ford C-Max Energi
  • P4F21 Ford C-Max Hybrid
  • P4F21 Ford Contour
  • P4F21 Ford Crown Victoria
  • P4F21 Ford EcoSport
  • P4F21 Ford Econoline
  • P4F21 Ford Edge
  • P4F21 Ford Escape
  • P4F21 Ford Escape Hybrid
  • P4F21 Ford Escort
  • P4F21 Ford Everest
  • P4F21 Ford Excursion
  • P4F21 Ford Expedition
  • P4F21 Ford Explorer
  • P4F21 Ford Explorer Sport Trac
  • P4F21 Ford F-150
  • P4F21 Ford F-250
  • P4F21 Ford F-350
  • P4F21 Ford Fiesta
  • P4F21 Ford Flex
  • P4F21 Ford Focus
  • P4F21 Ford Focus Electric
  • P4F21 Ford Freestar
  • P4F21 Ford Freestyle
  • P4F21 Ford Fusion
  • P4F21 Ford Fusion Energi
  • P4F21 Ford Fusion Hybrid
  • P4F21 Ford Fusion Plug-In Hybrid
  • P4F21 Ford GT
  • P4F21 Ford Mustang
  • P4F21 Ford Mustang Mach-E
  • P4F21 Ford Mystique
  • P4F21 Ford Probe
  • P4F21 Ford Ranger
  • P4F21 Ford Taurus
  • P4F21 Ford Taurus X
  • P4F21 Ford Tempo
  • P4F21 Ford Thunderbird
  • P4F21 Ford Transit
  • P4F21 Ford Transit Connect
  • P4F21 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.