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 may occur. If it turns out your glow plug light comes on while driving your Audi A6, it may signal some concerns. In the following paragraphs, we will do everything we can to help you see things more clearly. First, we will discover how the preheating light on your Audi A6 functions, and then the different explanations it lights up when you are driving

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What is the role of my Audi A6 glow plug light?

The main purpose of the engine glow plug light, which is generally represented by a yellow coil, is to assure that your glow plugs are working effectively. In reality, it must light up when you switch on your Audi A6 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 car. Nevertheless, if it turns on while driving, it may reveal several troubles, we will try to describe the most important ones.

What to do if the glow plug light comes on while driving on my Audi A6?

A glow light that comes on while driving on your Audi A6 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. No matter the reason, plug in your car to the diagnostic tool will allow you to carefully understand the explanation for the light up of your glow light.

My Audi A6 glow light comes on and I’m going through a loss of power

The first possibility is that you detect that your glow plug light comes on while driving your Audi A6 and that you also encounter a loss of power. In this case, some trouble can describe its presence. Here is a list of the most important reasons:

  • Problem of EGR valve, in fact, if you suffer a loss of power, it is possible that your EGR valve is clogged, in this instance, it is rational that your preheat light comes on while driving on Audi A6 because it is one of the failures of which it is designed to notify you. Have the status of your valve checked
  • Trouble 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 operation of the turbo.
  • Trouble in connection with the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that disturb its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Audi A6 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 A6

To conclude, we’ll give you the explanations for a glow plug light that comes on on your Audi A6 without you feeling any difference in power or car behaviour. Generally, 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 get rid of the problem.
  • 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

    • If you wish more guides on the Audi A6, go to our Audi A6 category.