B3721

B3721 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

B3721 Diagnosis

The BHM supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for an open circuit fault.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 B3721 Fault Code Meaning :

Ford B3721 Symptoms :

Ford B3721 Reasons :

How To Fix Ford B3721 Trouble Code ?

Which Ford cars have the code B3721?

  • B3721 Ford Aerostar
  • B3721 Ford Bronco
  • B3721 Ford C-Max
  • B3721 Ford C-Max Energi
  • B3721 Ford C-Max Hybrid
  • B3721 Ford Contour
  • B3721 Ford Crown Victoria
  • B3721 Ford EcoSport
  • B3721 Ford Econoline
  • B3721 Ford Edge
  • B3721 Ford Escape
  • B3721 Ford Escape Hybrid
  • B3721 Ford Escort
  • B3721 Ford Everest
  • B3721 Ford Excursion
  • B3721 Ford Expedition
  • B3721 Ford Explorer
  • B3721 Ford Explorer Sport Trac
  • B3721 Ford F-150
  • B3721 Ford F-250
  • B3721 Ford F-350
  • B3721 Ford Fiesta
  • B3721 Ford Flex
  • B3721 Ford Focus
  • B3721 Ford Focus Electric
  • B3721 Ford Freestar
  • B3721 Ford Freestyle
  • B3721 Ford Fusion
  • B3721 Ford Fusion Energi
  • B3721 Ford Fusion Hybrid
  • B3721 Ford Fusion Plug-In Hybrid
  • B3721 Ford GT
  • B3721 Ford Mustang
  • B3721 Ford Mustang Mach-E
  • B3721 Ford Mystique
  • B3721 Ford Probe
  • B3721 Ford Ranger
  • B3721 Ford Taurus
  • B3721 Ford Taurus X
  • B3721 Ford Tempo
  • B3721 Ford Thunderbird
  • B3721 Ford Transit
  • B3721 Ford Transit Connect
  • B3721 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.