C1521

C1521 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

C1521 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 position information for the switch becomes Not Available. Remove the duplicate Smart Switch, then use ServiceLink to verify that the correct Smart Switches are configured for the vehicle.

A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Barometric pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported.

Ford C1521 Fault Code Meaning :

Ford C1521 Symptoms :

Ford C1521 Reasons :

How To Fix Ford C1521 Trouble Code ?

Which Ford cars have the code C1521?

  • C1521 Ford Aerostar
  • C1521 Ford Bronco
  • C1521 Ford C-Max
  • C1521 Ford C-Max Energi
  • C1521 Ford C-Max Hybrid
  • C1521 Ford Contour
  • C1521 Ford Crown Victoria
  • C1521 Ford EcoSport
  • C1521 Ford Econoline
  • C1521 Ford Edge
  • C1521 Ford Escape
  • C1521 Ford Escape Hybrid
  • C1521 Ford Escort
  • C1521 Ford Everest
  • C1521 Ford Excursion
  • C1521 Ford Expedition
  • C1521 Ford Explorer
  • C1521 Ford Explorer Sport Trac
  • C1521 Ford F-150
  • C1521 Ford F-250
  • C1521 Ford F-350
  • C1521 Ford Fiesta
  • C1521 Ford Flex
  • C1521 Ford Focus
  • C1521 Ford Focus Electric
  • C1521 Ford Freestar
  • C1521 Ford Freestyle
  • C1521 Ford Fusion
  • C1521 Ford Fusion Energi
  • C1521 Ford Fusion Hybrid
  • C1521 Ford Fusion Plug-In Hybrid
  • C1521 Ford GT
  • C1521 Ford Mustang
  • C1521 Ford Mustang Mach-E
  • C1521 Ford Mystique
  • C1521 Ford Probe
  • C1521 Ford Ranger
  • C1521 Ford Taurus
  • C1521 Ford Taurus X
  • C1521 Ford Tempo
  • C1521 Ford Thunderbird
  • C1521 Ford Transit
  • C1521 Ford Transit Connect
  • C1521 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.