P3F21

P3F21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3F21 Diagnosis

The axle lift 2 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for axle lift 2 air solenoid fault, and for air pressure switch short circuit fault.The position information for the switch becomes Not Available. Remove the duplicate Smart Switch, then use ServiceLink to verify that the correct Smart Switches are configured for the vehicle.

A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Barometric pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported.

Ford P3F21 Fault Code Meaning :

Ford P3F21 Symptoms :

Ford P3F21 Reasons :

How To Fix Ford P3F21 Trouble Code ?

Which Ford cars have the code P3F21?

  • P3F21 Ford Aerostar
  • P3F21 Ford Bronco
  • P3F21 Ford C-Max
  • P3F21 Ford C-Max Energi
  • P3F21 Ford C-Max Hybrid
  • P3F21 Ford Contour
  • P3F21 Ford Crown Victoria
  • P3F21 Ford EcoSport
  • P3F21 Ford Econoline
  • P3F21 Ford Edge
  • P3F21 Ford Escape
  • P3F21 Ford Escape Hybrid
  • P3F21 Ford Escort
  • P3F21 Ford Everest
  • P3F21 Ford Excursion
  • P3F21 Ford Expedition
  • P3F21 Ford Explorer
  • P3F21 Ford Explorer Sport Trac
  • P3F21 Ford F-150
  • P3F21 Ford F-250
  • P3F21 Ford F-350
  • P3F21 Ford Fiesta
  • P3F21 Ford Flex
  • P3F21 Ford Focus
  • P3F21 Ford Focus Electric
  • P3F21 Ford Freestar
  • P3F21 Ford Freestyle
  • P3F21 Ford Fusion
  • P3F21 Ford Fusion Energi
  • P3F21 Ford Fusion Hybrid
  • P3F21 Ford Fusion Plug-In Hybrid
  • P3F21 Ford GT
  • P3F21 Ford Mustang
  • P3F21 Ford Mustang Mach-E
  • P3F21 Ford Mystique
  • P3F21 Ford Probe
  • P3F21 Ford Ranger
  • P3F21 Ford Taurus
  • P3F21 Ford Taurus X
  • P3F21 Ford Tempo
  • P3F21 Ford Thunderbird
  • P3F21 Ford Transit
  • P3F21 Ford Transit Connect
  • P3F21 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.