A new light on your dashboard? You don’t understand why it doesn’t shut off… It’s typical, an automobile is complex and there are various causes why a light could come on. In the event that your glow plug light comes on while driving your Mercedes Benz CLS Class, it might suggest different concerns. 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 Benz CLS Class functions, and then the different motives it lights up when you are driving

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What is the goal of my Mercedes Benz CLS Class glow plug light?

The primary purpose of the engine glow plug light, which is generally represented by a yellow coil, is to guarantee that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Benz CLS Class 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 turns on while driving, it may suggest multiple issues, 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 Benz CLS Class?

A glow light that comes on while driving on your Mercedes Benz CLS Class 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 take a look at this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to properly interpret the explanation for the light up of your glow light.

My Mercedes Benz CLS Class glow light comes on and I’m having a loss of power

The first possibility is that you notice that your glow plug light comes on while driving your Mercedes Benz CLS Class and that you also encounter a loss of power. In such a case, different trouble can explain its lightning. Here is a list of the most important causes:

  • Problem 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 expected that your preheat light comes on while driving on Mercedes Benz CLS Class because it is one of the issue of which it is supposed to alert you. Have the status of your valve tested
  • Problem linked 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.
  • 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 function.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Benz CLS Class 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 Benz CLS Class

Finally, we’ll give you the motives for a glow plug light that comes on on your Mercedes Benz CLS Class without you feeling any difference in power or vehicle behaviour. In general, this is an electronic problem:

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

    • To discover more tips on the Mercedes Benz CLS Class, take a look at the Mercedes Benz CLS Class category.