A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s typical, an auto is complex and there are multiple causes why a light could occur. In the event that your glow plug light comes on while driving your Mercedes Classe A 3, it might indicate different things. In this post, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe A 3 operates, and then the different reasons it lights up when you are driving

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What is the purpose of my Mercedes Classe A 3 glow plug light?

The primary role of the engine glow plug light, which is generally symbolized by a yellow coil, is to assure that your glow plugs are working properly. In fact, it must light up when you switch on your Mercedes Classe A 3 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 expected to stay or come on while driving with your motor vehicle. But, if it turns on while driving, it may suggest several issues, 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 3?

A glow light that comes on while driving on your Mercedes Classe A 3 or at any other time other than when the engine is started is intended to alert you to a problem other than your spark plugs, we will check out this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to precisely interpret the explanation for the light up of your glow light.

My Mercedes Classe A 3 glow light comes on and I’m having a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercedes Classe A 3 and that you also experience a loss of power. In such a case, different trouble can demonstrate its lightning. Here is a list of the most important causes:

  • Problem of EGR valve, indeed, if you go through 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 3 because it is one of the issue of which it is expected to alert you. Have the status of your valve looked at
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a disturbance in the operation of the turbo.
  • Problem related to 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 performance.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Classe A 3 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 Mercedes Classe A 3

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Classe A 3 without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic problem:

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

    • If you want more guides on the Mercedes Classe A 3, go to our Mercedes Classe A 3 category.