A new warning light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, an auto is complex and there are various causes why a light might occur. If it turns out your glow plug light comes on while driving your Audi Tt, it may suggest different problems. 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 Tt works, and then the different motives it lights up when you are driving

glow-plug-light-audi-tt

What is the goal of my Audi Tt glow plug light?

The primary role of the engine glow plug light, which is generally symbolized by a yellow coil, is to guarantee that your glow plugs are working correctly. In fact, it must light up when you switch on your Audi Tt 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 expected to stay or come on while driving with your car. Nevertheless, if it turns on while driving, it may suggest multiple troubles, we will try to describe the main ones.

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

A glow light that comes on while driving on your Audi Tt or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will take a look at this now. Whatever the case, plug in your car to the diagnostic tool will allow you to properly understand the explanation for the light up of your glow light.

My Audi Tt glow light comes on and I’m suffering from a loss of power

The first possibility is that you recognize that your glow plug light comes on while driving your Audi Tt and that you also encounter a loss of power. In this instance, different problems can describe its presence. Here is a list of the main causes:

  • Issue of EGR valve, in reality, if you suffer a loss of power, it is possible that your EGR valve is blocked, in this instance, it is logical that your preheat light comes on while driving on Audi Tt because it is one of the failures of which it is meant to warn you. Have the status of your valve checked out
  • Trouble associated with 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 damaged by filings or other possible foreign bodies that disturb its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Audi Tt coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Tt

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

  • Glow plug relays or fuses to be swapped out, 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 fix the problem.
  • 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 suggest you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error
  • To discover more tips on the Audi Tt, take a look at the Audi Tt category.