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2011 Fiesta Speedometer intermittent fault

husofiesta
husofiesta
in Ford Fiesta Club

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Hi everyone, 

My 2011 Ford Fiesta 1.4LTDi has recently developed an intermittent fault with the following symptoms:

  • Speedometer falls to 0 
  • ABS + Power Steering + Engine warning lights on the dash
  • Simultaneous slight dip in power

The problem first appeared during one of the recent very wet days, with the speedometer dropping to zero on the motorway. 

After running Forescan, I get a error code relating to the Left Front Wheel Speed Sensor (C0031).

If I stream data from each of the ABS wheel speed sensors, I can see that LFWSS (top) shows a fluctuating signal, even when stationary.

fault.thumb.PNG.2b582151d0ffed12dfee41c278a47e7e.PNG

Interestingly, in this case restarting the ignition seemed to correct the sensor.

working.thumb.PNG.4c8b98eee5de09475bafec8effd35246.PNG

Since the fault seems to comes an go at random, do you think what I am seeing is due to a bad connection somewhere along the way to the ABS control module OR that the LFWSS is on the way out. 

Any help on this would be great,

Thanks a lot in advance!

 

 

 

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