A new light on your dashboard? You don’t understand why it doesn’t switch off… It’s typical, a car is complicated and there are multiple factors why a light may occur. If your glow plug light comes on while driving your Ford Focus, it might point out different problems. In the following paragraphs, we will do everything we can to help you see things more clearly. First, we will find out how the preheating light on your Ford Focus functions, and then the different causes it lights up when you are driving

glow-plug-light-ford-focus

What is the goal of my Ford Focus glow plug light?

The main role of the engine glow plug light, which is in most cases represented by a yellow coil, is to make sure that your glow plugs are working effectively. Indeed, it must light up when you switch on your Ford Focus to tell you that they are heating the intake air in your cylinders and must go out after a few moments when the engine is running. This preheat light is therefore not expected to stay or come on while driving with your motor vehicle. However, if it turns on while driving, it may indicate multiple issues, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Ford Focus?

A glow light that comes on while driving on your Ford Focus or at any other time other than when the engine is started is meant to inform you to a problem other than your spark plugs, we will look at this now. Whatever the case, a switch to the diagnostic tool will allow you to accurately understand the reason for the light up of your glow light.

My Ford Focus glow light comes on and I’m going through a loss of power

The first possibility is that you identify that your glow plug light comes on while driving your Ford Focus and that you also knowledge a loss of power. In such a case, different complications can describe its presence. Here is a list of the main factors:

  • Issue of EGR valve, in reality, if you go through a loss of power, it is possible that your EGR valve is clogged, in this case, it is logical that your preheat light comes on while driving on Ford Focus because it is one of the failures of which it is meant to notify you. Have the status of your valve examined
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a perturbation in the performance of the turbo.
  • Trouble in connection with the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that disrupt its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Ford Focus coupled with a loss of power, is that your fuel filter is too dirty, you should get jerks because of a bad fuel flow in the engine.

My glow plug light comes on or is flashing but no difference on the performance of my Ford Focus

Finally, we’ll give you the causes for a glow plug light that comes on on your Ford Focus without you feeling any difference in power or motor vehicle behaviour. In most cases, this is an electronic problem:

  • Glow plug relays or fuses to be swapped out, test and replace if necessary.
  • A contactor/potentiometer on one of your pedals (brake, accelerator or clutch) has failed, often a simple de-seizure will be enough to get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives first because it is not easy to find it alone, we encourage you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • If you need more guides on the Ford Focus, go to our Ford Focus category.