A new light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, a car is complex and there are various motives why a light could come on. If your glow plug light comes on while driving your Mercedes Classe E 4, it may indicate some problems. In this post, we will do anything we can to support you see things more clearly. First, we will see how the preheating light on your Mercedes Classe E 4 functions, and then the different causes it lights up when you are driving

glow-plug-light-mercedes-classe-e-4

What is the purpose of my Mercedes Classe E 4 glow plug light?

The primary role of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to assure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Classe E 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 car. Nevertheless, if it comes on while driving, it may suggest multiple failures, we will try to point out the most important ones.

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

A glow light that comes on while driving on your Mercedes Classe E 4 or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will check out this right now. In any case, a switch to the diagnostic tool will allow you to precisely translate the cause for the light up of your glow light.

My Mercedes Classe E 4 glow light comes on and I’m experiencing a loss of power

The first situation is that you recognize that your glow plug light comes on while driving your Mercedes Classe E 4 and that you also experience a loss of power. In this instance, some concerns can explain its presence. Here is a list of the most important motives:

  • Problem of EGR valve, in fact, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this instance, it is expected that your preheat light comes on while driving on Mercedes Classe E 4 because it is one of the issue of which it is intended to notify you. Have the status of your valve checked out
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a perturbation in the performance of the turbo.
  • Trouble linked 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 disturb its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Classe E 4 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 E 4

To conclude, we’ll give you the causes for a glow plug light that comes on on your Mercedes Classe E 4 without you feeling any difference in power or car behaviour. In most cases, this is an electronic problem:

  • 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 solve the trouble.
  • 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 auto mechanic.
  • Faulty injection pressure sensor, ECU error

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