A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s typical, an automobile is elaborate and there are multiple factors why a light might occur. If it turns out your glow plug light comes on while driving your Mercedes Classe E 5, it might signal several problems. On this page, we will do everything we can to support you see things more clearly. First, we will see how the preheating light on your Mercedes Classe E 5 works, and then the different explanations it lights up when you are driving

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What is the goal of my Mercedes Classe E 5 glow plug light?

The main purpose of the engine glow plug light, which is generally symbolized by a yellow coil, is to guarantee that your glow plugs are working effectively. In fact, it must light up when you switch on your Mercedes Classe E 5 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 supposed to stay or come on while driving with your vehicle. But, if it comes on while driving, it may suggest different failures, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe E 5?

A glow light that comes on while driving on your Mercedes Classe E 5 or at any other time other than when the engine is started is designed to alert you to a fault other than your spark plugs, we will take a look at this now. In any case, connecting your vehicle to the diagnostic tool will allow you to carefully understand the motive for the light up of your glow light.

My Mercedes Classe E 5 glow light comes on and I’m experiencing a loss of power

The first situation is that you detect that your glow plug light comes on while driving your Mercedes Classe E 5 and that you also experience a loss of power. In this instance, several trouble can demonstrate its lightning. Here is a list of the main factors:

  • Issue of EGR valve, in fact, if you suffer a loss of power, it is possible that your EGR valve is blocked, in this case, it is obvious that your preheat light comes on while driving on Mercedes Classe E 5 because it is one of the failures of which it is expected to warn 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 result in turbo boost and a disturbance in the performance of the turbo.
  • Problem related to the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disrupt its proper performance.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Classe E 5 coupled with a loss of power, is that your fuel filter is too dirty, you should encounter 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 5

Finally, we’ll give you the explanations for a glow plug light that comes on on your Mercedes Classe E 5 without you feeling any difference in power or vehicle behaviour. Ordinarily, this is an electronic fault:

  • 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 solve the trouble.
  • 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 encourage you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more tutorials on the Mercedes Classe E 5, go to our Mercedes Classe E 5 category.