B121B

B121B Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

B121B 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 B121B Fault Code Meaning :

Ford B121B Symptoms :

Ford B121B Reasons :

How To Fix Ford B121B Trouble Code ?

Which Ford cars have the code B121B?

  • B121B Ford Aerostar
  • B121B Ford Bronco
  • B121B Ford C-Max
  • B121B Ford C-Max Energi
  • B121B Ford C-Max Hybrid
  • B121B Ford Contour
  • B121B Ford Crown Victoria
  • B121B Ford EcoSport
  • B121B Ford Econoline
  • B121B Ford Edge
  • B121B Ford Escape
  • B121B Ford Escape Hybrid
  • B121B Ford Escort
  • B121B Ford Everest
  • B121B Ford Excursion
  • B121B Ford Expedition
  • B121B Ford Explorer
  • B121B Ford Explorer Sport Trac
  • B121B Ford F-150
  • B121B Ford F-250
  • B121B Ford F-350
  • B121B Ford Fiesta
  • B121B Ford Flex
  • B121B Ford Focus
  • B121B Ford Focus Electric
  • B121B Ford Freestar
  • B121B Ford Freestyle
  • B121B Ford Fusion
  • B121B Ford Fusion Energi
  • B121B Ford Fusion Hybrid
  • B121B Ford Fusion Plug-In Hybrid
  • B121B Ford GT
  • B121B Ford Mustang
  • B121B Ford Mustang Mach-E
  • B121B Ford Mystique
  • B121B Ford Probe
  • B121B Ford Ranger
  • B121B Ford Taurus
  • B121B Ford Taurus X
  • B121B Ford Tempo
  • B121B Ford Thunderbird
  • B121B Ford Transit
  • B121B Ford Transit Connect
  • B121B 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.