A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, an auto is elaborate and there are multiple motives why a light might occur. If your glow plug light comes on while driving your Volkswagen Polo 8, it might signal several things. In this post, we will do everything we can to help you see things more clearly. First, we will discover how the preheating light on your Volkswagen Polo 8 works, and then the different causes it lights up when you are driving

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What is the purpose of my Volkswagen Polo 8 glow plug light?

The main goal of the engine glow plug light, which is generally symbolized by a yellow coil, is to guarantee that your glow plugs are working properly. In reality, it must light up when you switch on your Volkswagen Polo 8 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 meant to stay or come on while driving with your vehicle. Nevertheless, if it comes on while driving, it may show different failures, we will try to explain the most important ones.

What to do if the glow plug light comes on while driving on my Volkswagen Polo 8?

A glow light that comes on while driving on your Volkswagen Polo 8 or at any other time other than when the engine is started is meant to notify you to a problem other than your spark plugs, we will check out this right now. In any case, connecting your vehicle to the diagnostic tool will allow you to carefully understand the reason for the light up of your glow light.

My Volkswagen Polo 8 glow light comes on and I’m suffering from a loss of power

The first situation is that you detect that your glow plug light comes on while driving your Volkswagen Polo 8 and that you also experience a loss of power. In this instance, several concerns can describe its lightning. Here is a list of the most important motives:

  • Problem of EGR valve, in fact, if you go through a loss of power, it is possible that your EGR valve is blocked, in this case, it is logical that your preheat light comes on while driving on Volkswagen Polo 8 because it is one of the issue of which it is expected to warn you. Have the status of your valve tested
  • Issue related to 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 performance of the turbo.
  • Issue relevant 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 disturb its proper operation.
  • Finally, the last problem that could lead to a glow indicator light on your Volkswagen Polo 8 coupled with a loss of power, is that your fuel filter is too dirty, you should encounter 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 8

To conclude, we’ll give you the causes for a glow plug light that comes on on your Volkswagen Polo 8 without you feeling any difference in power or vehicle behaviour. In most cases, this is an electronic problem:

  • 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 problem.
  • You have a false contact somewhere in your electrical circuit, check the other alternatives first because it is not easy to find it alone, we recommend you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Volkswagen Polo 8, take a look at the Volkswagen Polo 8 category.