A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, an auto is complicated and there are various reasons why a light could occur. If it turns out your glow plug light comes on while driving your Mercedes Slk, it may possibly reveal several concerns. In this article, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Slk works, and then the different motives it lights up when you are driving

glow-plug-light-mercedes-slk

What is the goal of my Mercedes Slk glow plug light?

The main goal of the engine glow plug light, which is generally represented 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 Slk 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 car. But, if it comes on while driving, it may reveal several troubles, we will try to point out the main ones.

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

A glow light that comes on while driving on your Mercedes Slk or at any other time other than when the engine is started is designed to warn you to a problem 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 precisely translate the motive for the light up of your glow light.

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

The first probability is that you detect that your glow plug light comes on while driving your Mercedes Slk and that you also encounter a loss of power. In this case, several complications can explain its presence. Here is a list of the main reasons:

  • Issue of EGR valve, in fact, if you are affected 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 Slk because it is one of the problem of which it is designed to alert you. Have the status of your valve checked
  • Trouble related to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can cause turbo boost and a disturbance in the operation of the turbo.
  • Trouble 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 disturb its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Slk 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 Slk

To conclude, we’ll give you the motives for a glow plug light that comes on on your Mercedes Slk 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 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 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 auto technician.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Mercedes Slk, take a look at the Mercedes Slk category.