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Matt
Matt, Mechanical Engineer
Category: Ford
Satisfied Customers: 20602
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My glow plug light comes back on and stays on after about

Customer Question

Hi
My glow plug light comes back on and stays on after about five minutes
there seems to be a power/performance drop at the same time
Submitted: 1 year ago.
Category: Ford
Expert:  Matt replied 1 year ago.

Hello

On this car a glow plug light staying on typically means one or more of the sensors has failed or has a faulty connection.

The fault can be something quite simple and nothing that’s going to stop the car to something quite major that will reduce engine power and possibly stop the engine

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.

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    Matt

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