A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, an automobile is complex and there are multiple motives why a light could come on. If your glow plug light comes on while driving your Audi A5, it might suggest some problems. On this page, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Audi A5 works, and then the different reasons it lights up when you are driving

glow-plug-light-audi-a5

What is the purpose of my Audi A5 glow plug light?

The primary goal of the engine glow plug light, which is most of the time 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 A5 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 automobile. Nevertheless, if it comes on while driving, it may reveal several failures, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my Audi A5?

A glow light that comes on while driving on your Audi A5 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 now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to accurately understand the reason for the light up of your glow light.

My Audi A5 glow light comes on and I’m having a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Audi A5 and that you also knowledge a loss of power. In this instance, some problems can explain its presence. Here is a list of the main motives:

  • Trouble of EGR valve, in reality, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this case, it is expected that your preheat light comes on while driving on Audi A5 because it is one of the failures of which it is expected to alert you. Have the status of your valve inspected
  • Issue related to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can result in turbo boost and a disturbance in the performance of the turbo.
  • Issue 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 affect its proper performance.
  • Finally, the last trouble that could lead to a glow indicator light on your Audi A5 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 A5

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Audi A5 without you feeling any difference in power or automobile behaviour. In general, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 resolve the trouble.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we advise you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error
  • If you want more tutorials on the Audi A5, go to our Audi A5 category.