P21A1

P21A1 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21A1 Diagnosis

The fault remains active until the ignition is turned ON when the fault is no longer present. Some BHM configurations force this circuit off until the ignition switch is cycled.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 P21A1 Fault Code Meaning :

Ford P21A1 Symptoms :

Ford P21A1 Reasons :

How To Fix Ford P21A1 Trouble Code ?

Which Ford cars have the code P21A1?

  • P21A1 Ford Aerostar
  • P21A1 Ford Bronco
  • P21A1 Ford C-Max
  • P21A1 Ford C-Max Energi
  • P21A1 Ford C-Max Hybrid
  • P21A1 Ford Contour
  • P21A1 Ford Crown Victoria
  • P21A1 Ford EcoSport
  • P21A1 Ford Econoline
  • P21A1 Ford Edge
  • P21A1 Ford Escape
  • P21A1 Ford Escape Hybrid
  • P21A1 Ford Escort
  • P21A1 Ford Everest
  • P21A1 Ford Excursion
  • P21A1 Ford Expedition
  • P21A1 Ford Explorer
  • P21A1 Ford Explorer Sport Trac
  • P21A1 Ford F-150
  • P21A1 Ford F-250
  • P21A1 Ford F-350
  • P21A1 Ford Fiesta
  • P21A1 Ford Flex
  • P21A1 Ford Focus
  • P21A1 Ford Focus Electric
  • P21A1 Ford Freestar
  • P21A1 Ford Freestyle
  • P21A1 Ford Fusion
  • P21A1 Ford Fusion Energi
  • P21A1 Ford Fusion Hybrid
  • P21A1 Ford Fusion Plug-In Hybrid
  • P21A1 Ford GT
  • P21A1 Ford Mustang
  • P21A1 Ford Mustang Mach-E
  • P21A1 Ford Mystique
  • P21A1 Ford Probe
  • P21A1 Ford Ranger
  • P21A1 Ford Taurus
  • P21A1 Ford Taurus X
  • P21A1 Ford Tempo
  • P21A1 Ford Thunderbird
  • P21A1 Ford Transit
  • P21A1 Ford Transit Connect
  • P21A1 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.