A new warning light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, an automobile is complex and there are multiple motives why a light might occur. In cases where your glow plug light comes on while driving your Mercedes Classe A, it might indicate different things. On this page, we will do everything we can to help you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe A functions, and then the different motives it lights up when you are driving

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

The primary role of the engine glow plug light, which is in most cases symbolized by a yellow coil, is to ensure that your glow plugs are working correctly. In fact, it must light up when you switch on your Mercedes Classe A 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 motor vehicle. But, if it turns on while driving, it may show multiple issues, we will try to explain the main ones.

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

A glow light that comes on while driving on your Mercedes Classe A 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. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to carefully understand the reason for the light up of your glow light.

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

The first situation is that you recognize that your glow plug light comes on while driving your Mercedes Classe A and that you also experience a loss of power. In this instance, different complications can demonstrate its lightning. Here is a list of the main motives:

  • Issue 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 Classe A because it is one of the failures of which it is supposed to warn you. Have the status of your valve checked
  • Issue associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in turbo boost and a disturbance in the performance of the turbo.
  • Issue in connection with the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that affect its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Classe A 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 Classe A

To finish , we’ll give you the motives for a glow plug light that comes on on your Mercedes Classe A without you feeling any difference in power or motor vehicle 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 solutions first because it is not easy to find it alone, we suggest you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

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