P21F4

P21F4 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21F4 Diagnosis

The CHM does not suupport PWM type DRLs. The vehicle has a BHM mismatch with the CHM. Replace the CHM with one that is compatible with the BHM.The BHM is detecting more than one smart switch with the same ID number present on the vehicle. The outputs controlled by the switch and the indicator in the switch are commanded OFF.

The disconnected pipe malfunction is detected when the ventilator tube from the valve cover to the separator device is disconnected resulting in a pressure below the lower limit.Both of these malfunctions will result in a DTC being set.

Ford P21F4 Fault Code Meaning :

Ford P21F4 Symptoms :

Ford P21F4 Reasons :

How To Fix Ford P21F4 Trouble Code ?

Which Ford cars have the code P21F4?

  • P21F4 Ford Aerostar
  • P21F4 Ford Bronco
  • P21F4 Ford C-Max
  • P21F4 Ford C-Max Energi
  • P21F4 Ford C-Max Hybrid
  • P21F4 Ford Contour
  • P21F4 Ford Crown Victoria
  • P21F4 Ford EcoSport
  • P21F4 Ford Econoline
  • P21F4 Ford Edge
  • P21F4 Ford Escape
  • P21F4 Ford Escape Hybrid
  • P21F4 Ford Escort
  • P21F4 Ford Everest
  • P21F4 Ford Excursion
  • P21F4 Ford Expedition
  • P21F4 Ford Explorer
  • P21F4 Ford Explorer Sport Trac
  • P21F4 Ford F-150
  • P21F4 Ford F-250
  • P21F4 Ford F-350
  • P21F4 Ford Fiesta
  • P21F4 Ford Flex
  • P21F4 Ford Focus
  • P21F4 Ford Focus Electric
  • P21F4 Ford Freestar
  • P21F4 Ford Freestyle
  • P21F4 Ford Fusion
  • P21F4 Ford Fusion Energi
  • P21F4 Ford Fusion Hybrid
  • P21F4 Ford Fusion Plug-In Hybrid
  • P21F4 Ford GT
  • P21F4 Ford Mustang
  • P21F4 Ford Mustang Mach-E
  • P21F4 Ford Mystique
  • P21F4 Ford Probe
  • P21F4 Ford Ranger
  • P21F4 Ford Taurus
  • P21F4 Ford Taurus X
  • P21F4 Ford Tempo
  • P21F4 Ford Thunderbird
  • P21F4 Ford Transit
  • P21F4 Ford Transit Connect
  • P21F4 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.