A new light on your dashboard? You don’t figure out why it doesn’t turn off… It’s typical, an automobile is elaborate and there are various causes why a light may come on. In the event that your glow plug light comes on while driving your Volkswagen Golf 4, it might suggest several problems. In this article, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your Volkswagen Golf 4 works, and then the different reasons it lights up when you are driving

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What is the role of my Volkswagen Golf 4 glow plug light?

The main role of the engine glow plug light, which is in most cases represented by a yellow coil, is to ensure that your glow plugs are working properly. In reality, it must light up when you switch on your Volkswagen Golf 4 to tell you that they are heating the intake air in your cylinders and must go out after a few minutes when the engine is running. This preheat light is therefore not meant to stay or come on while driving with your vehicle. But, if it turns on while driving, it may indicate several issues, we will try to describe the main ones.

What to do if the glow plug light comes on while driving on my Volkswagen Golf 4?

A glow light that comes on while driving on your Volkswagen Golf 4 or at any other time other than when the engine is started is intended to alert you to a fault other than your spark plugs, we will take a look at this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to accurately interpret the cause for the light up of your glow light.

My Volkswagen Golf 4 glow light comes on and I’m having a loss of power

The first situation is that you recognize that your glow plug light comes on while driving your Volkswagen Golf 4 and that you also knowledge a loss of power. In this case, several problems can demonstrate its presence. Here is a list of the main causes:

  • Problem of EGR valve, in fact, if you undergo a loss of power, it is possible that your EGR valve is blocked, in such a case, it is expected that your preheat light comes on while driving on Volkswagen Golf 4 because it is one of the failures of which it is intended to warn you. Have the status of your valve checked
  • 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 linked to the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that affect its proper operation.
  • Finally, the last issue that could lead to a glow indicator light on your Volkswagen Golf 4 coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel 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 Volkswagen Golf 4

Finally, we’ll give you the reasons for a glow plug light that comes on on your Volkswagen Golf 4 without you feeling any difference in power or vehicle behaviour. Generally, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 the other solutions first because it is not easy to find it alone, we advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • If you wish more guides on the Volkswagen Golf 4, go to our Volkswagen Golf 4 category.