B0121

B0121 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

B0121 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.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

This circuit connects to the CHM as an input at connector J3,P. The CHM passes the signal through to power the tail lamps and marker lamps from connector C2 pin G and also from connector C1 pins D, E, and F.

Ford B0121 Fault Code Meaning :

Ford B0121 Symptoms :

Ford B0121 Reasons :

How To Fix Ford B0121 Trouble Code ?

Which Ford cars have the code B0121?

  • B0121 Ford Aerostar
  • B0121 Ford Bronco
  • B0121 Ford C-Max
  • B0121 Ford C-Max Energi
  • B0121 Ford C-Max Hybrid
  • B0121 Ford Contour
  • B0121 Ford Crown Victoria
  • B0121 Ford EcoSport
  • B0121 Ford Econoline
  • B0121 Ford Edge
  • B0121 Ford Escape
  • B0121 Ford Escape Hybrid
  • B0121 Ford Escort
  • B0121 Ford Everest
  • B0121 Ford Excursion
  • B0121 Ford Expedition
  • B0121 Ford Explorer
  • B0121 Ford Explorer Sport Trac
  • B0121 Ford F-150
  • B0121 Ford F-250
  • B0121 Ford F-350
  • B0121 Ford Fiesta
  • B0121 Ford Flex
  • B0121 Ford Focus
  • B0121 Ford Focus Electric
  • B0121 Ford Freestar
  • B0121 Ford Freestyle
  • B0121 Ford Fusion
  • B0121 Ford Fusion Energi
  • B0121 Ford Fusion Hybrid
  • B0121 Ford Fusion Plug-In Hybrid
  • B0121 Ford GT
  • B0121 Ford Mustang
  • B0121 Ford Mustang Mach-E
  • B0121 Ford Mystique
  • B0121 Ford Probe
  • B0121 Ford Ranger
  • B0121 Ford Taurus
  • B0121 Ford Taurus X
  • B0121 Ford Tempo
  • B0121 Ford Thunderbird
  • B0121 Ford Transit
  • B0121 Ford Transit Connect
  • B0121 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.