A new light on your dashboard? You don’t figure out why it doesn’t turn off… It’s typical, a car is elaborate and there are multiple factors why a light may come on. If your glow plug light comes on while driving your Mercedes A class, it may possibly signal several things. In this article, we will do anything we can to help you see things more clearly. First, we will see how the preheating light on your Mercedes A class operates, and then the different causes it lights up when you are driving

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What is the purpose of my Mercedes A class glow plug light?

The primary role of the engine glow plug light, which is most of the time 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 Mercedes A class 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 automobile. Nevertheless, if it comes on while driving, it may suggest different issues, we will try to describe the main ones.

What to do if the glow plug light comes on while driving on my Mercedes A class?

A glow light that comes on while driving on your Mercedes A class or at any other time other than when the engine is started is meant to warn you to a fault other than your spark plugs, we will look at this right now. In any case, a switch to the diagnostic tool will allow you to precisely translate the motive for the light up of your glow light.

My Mercedes A class glow light comes on and I’m encountering a loss of power

The first probability is that you perceive that your glow plug light comes on while driving your Mercedes A class and that you also experience a loss of power. In such a case, several concerns can explain its lightning. Here is a list of the main factors:

  • Trouble of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is blocked, in such a case, it is expected that your preheat light comes on while driving on Mercedes A class because it is one of the problem of which it is designed to warn you. Have the status of your valve inspected
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can bring about turbo boost and a perturbation in the performance of the turbo.
  • Trouble related to the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that disrupt its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes A class 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 Mercedes A class

To conclude, we’ll give you the causes for a glow plug light that comes on on your Mercedes A class 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 problem.
  • 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 technician.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Mercedes A class, take a look at the Mercedes A class category.