A new light on your dashboard? You don’t find out why it doesn’t turn off… It’s typical, a car is elaborate and there are multiple causes why a light might come on. If your glow plug light comes on while driving your Volkswagen Polo 5, it may show some issues. In this article, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Volkswagen Polo 5 functions, and then the different explanations it lights up when you are driving

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What is the purpose of my Volkswagen Polo 5 glow plug light?

The primary goal of the engine glow plug light, which is in most cases represented by a yellow coil, is to guarantee that your glow plugs are working correctly. In reality, it must light up when you switch on your Volkswagen Polo 5 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. Nevertheless, if it comes on while driving, it may suggest multiple failures, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Volkswagen Polo 5?

A glow light that comes on while driving on your Volkswagen Polo 5 or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will take a look at this now. In any case, a switch to the diagnostic tool will allow you to precisely understand the motive for the light up of your glow light.

My Volkswagen Polo 5 glow light comes on and I’m having a loss of power

The first probability is that you detect that your glow plug light comes on while driving your Volkswagen Polo 5 and that you also experience a loss of power. In this case, some complications can demonstrate its lightning. Here is a list of the main causes:

  • Issue of EGR valve, indeed, if you undergo a loss of power, it is possible that your EGR valve is clogged, in this case, it is rational that your preheat light comes on while driving on Volkswagen Polo 5 because it is one of the issue of which it is intended to warn you. Have the status of your valve checked
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can cause turbo boost and a disturbance in the operation of the turbo.
  • Problem linked to the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disturb its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Volkswagen Polo 5 coupled with a loss of power, is that your fuel filter is too dirty, you should 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 Polo 5

To finish , we’ll give you the explanations for a glow plug light that comes on on your Volkswagen Polo 5 without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic problem:

  • Glow plug relays or fuses to be changed, 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, check the other options first because it is not easy to find it alone, we suggest you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Volkswagen Polo 5, take a look at the Volkswagen Polo 5 category.