A new light on your dashboard? You don’t understand why it doesn’t shut off… It’s normal, an auto is complex and there are multiple factors why a light may come on. In the event that your glow plug light comes on while driving your Mercedes Classe A 4, it may possibly reveal several concerns. On this page, we will do everything we can to help you see things more clearly. First, we will discover how the preheating light on your Mercedes Classe A 4 works, and then the different motives it lights up when you are driving

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What is the role of my Mercedes Classe A 4 glow plug light?

The main goal of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to make sure that your glow plugs are working properly. In reality, it must light up when you switch on your Mercedes Classe A 4 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 vehicle. Nevertheless, if it turns on while driving, it may show multiple troubles, we will try to describe the most important ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe A 4?

A glow light that comes on while driving on your Mercedes Classe A 4 or at any other time other than when the engine is started is designed to inform you to a fault other than your spark plugs, we will check out this now. No matter the reason, plug in your car to the diagnostic tool will allow you to carefully translate the cause for the light up of your glow light.

My Mercedes Classe A 4 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 Mercedes Classe A 4 and that you also knowledge a loss of power. In such a case, several trouble can explain its lightning. Here is a list of the most important factors:

  • Trouble of EGR valve, in reality, if you suffer a loss of power, it is possible that your EGR valve is clogged, in this case, it is rational that your preheat light comes on while driving on Mercedes Classe A 4 because it is one of the failures of which it is meant 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 control the turbo intake pressure, which can bring about turbo boost and a perturbation in the performance of the turbo.
  • Issue related to the injection, either an injector that has seized up or the injection pump that is malfunctioned 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 Mercedes Classe A 4 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 Mercedes Classe A 4

To finish , we’ll give you the motives for a glow plug light that comes on on your Mercedes Classe A 4 without you feeling any difference in power or vehicle behaviour. In general, this is an electronic fault:

  • Glow plug relays or fuses to be changed, 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 fix the trouble.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives first because it is not easy to find it alone, we encourage you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • If you need more tutorials on the Mercedes Classe A 4, go to our Mercedes Classe A 4 category.