A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, a vehicle is complex and there are many reasons why a light could occur. In the event that your glow plug light comes on while driving your Audi A3, it may point out different things. In the following paragraphs, we will do anything we can to help you see things more clearly. First, we will find out how the preheating light on your Audi A3 works, and then the different reasons it lights up when you are driving

glow-plug-light-audi-a3

What is the purpose of my Audi A3 glow plug light?

The primary intent of the engine glow plug light, which is generally symbolized by a yellow coil, is to assure that your glow plugs are working properly. In reality, it must light up when you switch on your Audi A3 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 vehicle. But, if it turns on while driving, it may show several troubles, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Audi A3?

A glow light that comes on while driving on your Audi A3 or at any other time other than when the engine is started is intended to inform you to a fault other than your spark plugs, we will look at this right now. No matter the reason, a switch to the diagnostic tool will allow you to properly interpret the motive for the light up of your glow light.

My Audi A3 glow light comes on and I’m encountering a loss of power

The first situation is that you perceive that your glow plug light comes on while driving your Audi A3 and that you also encounter a loss of power. In such a case, different complications can explain its lightning. Here is a list of the main reasons:

  • Trouble of EGR valve, in reality, if you are affected 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 Audi A3 because it is one of the issue of which it is intended to alert you. Have the status of your valve checked out
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in 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 malfunctioned by filings or other possible foreign bodies that affect its proper performance.
  • Finally, the last issue that could lead to a glow indicator light on your Audi A3 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 Audi A3

Finally, we’ll give you the reasons for a glow plug light that comes on on your Audi A3 without you feeling any difference in power or vehicle behaviour. In general, 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 solve the issue.
  • You have a false contact somewhere in your electrical circuit, test the other alternatives first because it is not easy to find it alone, we suggest you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error

    • In the event that you have any additional questions about the Audi A3, do not hesitate to consult our Audi A3 category.