A new light on your dashboard? You don’t figure out why it doesn’t turn off… It’s normal, an automobile is complicated and there are multiple causes why a light could occur. If it turns out your glow plug light comes on while driving your Audi A8, it may possibly signify several issues. In the following paragraphs, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Audi A8 functions, and then the different reasons it lights up when you are driving

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What is the role of my Audi A8 glow plug light?

The primary intent of the engine glow plug light, which is generally represented by a yellow coil, is to assure that your glow plugs are working correctly. In fact, it must light up when you switch on your Audi A8 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 supposed to stay or come on while driving with your motor vehicle. Nevertheless, if it comes on while driving, it may reveal different issues, we will try to explain the most important ones.

What to do if the glow plug light comes on while driving on my Audi A8?

A glow light that comes on while driving on your Audi A8 or at any other time other than when the engine is started is intended to notify you to a fault other than your spark plugs, we will check out this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to precisely interpret the cause for the light up of your glow light.

My Audi A8 glow light comes on and I’m going through a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Audi A8 and that you also knowledge a loss of power. In this case, several concerns can describe its presence. Here is a list of the most important causes:

  • Trouble of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this instance, it is expected that your preheat light comes on while driving on Audi A8 because it is one of the failures of which it is meant to notify you. Have the status of your valve checked
  • Issue associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a disturbance in the performance of the turbo.
  • Issue related to the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that disrupt its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Audi A8 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 Audi A8

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Audi A8 without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic fault:

  • Glow plug relays or fuses to be changed, test and change 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 trouble.
  • 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 auto technician.
  • Faulty injection pressure sensor, ECU error
  • If you need more guides on the Audi A8, go to our Audi A8 category.