A new light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, a vehicle is elaborate and there are many reasons why a light could occur. In cases where your glow plug light comes on while driving your Audi A4, it may possibly signal some issues. On this page, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your Audi A4 operates, and then the different motives it lights up when you are driving

glow-plug-light-audi-a4

What is the role of my Audi A4 glow plug light?

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to guarantee that your glow plugs are working effectively. Indeed, it must light up when you switch on your Audi A4 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 supposed to stay or come on while driving with your car. But, if it turns on while driving, it may suggest different failures, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Audi A4?

A glow light that comes on while driving on your Audi A4 or at any other time other than when the engine is started is meant to inform you to a problem other than your spark plugs, we will check out this now. No matter the reason, a switch to the diagnostic tool will allow you to carefully interpret the explanation for the light up of your glow light.

My Audi A4 glow light comes on and I’m encountering a loss of power

The first possibility is that you recognize that your glow plug light comes on while driving your Audi A4 and that you also encounter a loss of power. In this instance, some concerns can demonstrate its lightning. Here is a list of the main reasons:

  • Trouble of EGR valve, in reality, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this instance, it is obvious that your preheat light comes on while driving on Audi A4 because it is one of the issue of which it is designed to warn you. Have the status of your valve looked at
  • Trouble linked 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 operation of the turbo.
  • Trouble associated 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 disrupt its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Audi A4 coupled with a loss of power, is that your fuel filter is too dirty, you should come to 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 A4

Finally, we’ll give you the motives for a glow plug light that comes on on your Audi A4 without you feeling any difference in power or car behaviour. Generally, this is an electronic problem:

  • Glow plug relays or fuses to be changed, 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 resolve the issue.
  • 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 recommend you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • To discover more tips on the Audi A4, take a look at the Audi A4 category.