P21A4

P21A4 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21A4 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 P21A4 Fault Code Meaning :

Ford P21A4 Symptoms :

Ford P21A4 Reasons :

How To Fix Ford P21A4 Trouble Code ?

Which Ford cars have the code P21A4?

  • P21A4 Ford Aerostar
  • P21A4 Ford Bronco
  • P21A4 Ford C-Max
  • P21A4 Ford C-Max Energi
  • P21A4 Ford C-Max Hybrid
  • P21A4 Ford Contour
  • P21A4 Ford Crown Victoria
  • P21A4 Ford EcoSport
  • P21A4 Ford Econoline
  • P21A4 Ford Edge
  • P21A4 Ford Escape
  • P21A4 Ford Escape Hybrid
  • P21A4 Ford Escort
  • P21A4 Ford Everest
  • P21A4 Ford Excursion
  • P21A4 Ford Expedition
  • P21A4 Ford Explorer
  • P21A4 Ford Explorer Sport Trac
  • P21A4 Ford F-150
  • P21A4 Ford F-250
  • P21A4 Ford F-350
  • P21A4 Ford Fiesta
  • P21A4 Ford Flex
  • P21A4 Ford Focus
  • P21A4 Ford Focus Electric
  • P21A4 Ford Freestar
  • P21A4 Ford Freestyle
  • P21A4 Ford Fusion
  • P21A4 Ford Fusion Energi
  • P21A4 Ford Fusion Hybrid
  • P21A4 Ford Fusion Plug-In Hybrid
  • P21A4 Ford GT
  • P21A4 Ford Mustang
  • P21A4 Ford Mustang Mach-E
  • P21A4 Ford Mystique
  • P21A4 Ford Probe
  • P21A4 Ford Ranger
  • P21A4 Ford Taurus
  • P21A4 Ford Taurus X
  • P21A4 Ford Tempo
  • P21A4 Ford Thunderbird
  • P21A4 Ford Transit
  • P21A4 Ford Transit Connect
  • P21A4 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.