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 factors why a light might come on. In cases where your glow plug light comes on while driving your smart forfour, it might signify different things. 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 smart forfour operates, and then the different causes it lights up when you are driving

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What is the role of my smart forfour glow plug light?

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to make sure that your glow plugs are working correctly. In reality, it must light up when you switch on your smart forfour 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 vehicle. However, if it comes on while driving, it may suggest several 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 smart forfour?

A glow light that comes on while driving on your smart forfour or at any other time other than when the engine is started is meant to warn you to a fault 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 precisely translate the cause for the light up of your glow light.

My smart forfour glow light comes on and I’m experiencing a loss of power

The first probability is that you perceive that your glow plug light comes on while driving your smart forfour and that you also experience a loss of power. In this case, different trouble can explain its lightning. Here is a list of the most important factors:

  • Trouble 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 logical that your preheat light comes on while driving on smart forfour because it is one of the problem of which it is meant to alert you. Have the status of your valve examined
  • Trouble associated with 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.
  • Trouble linked to the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that affect its proper performance.
  • Finally, the last trouble that could lead to a glow indicator light on your smart forfour 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 smart forfour

To conclude, we’ll give you the causes for a glow plug light that comes on on your smart forfour without you feeling any difference in power or vehicle behaviour. Generally, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 get rid of the trouble.
  • 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 suggest you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error

    • If you want more guides on the smart forfour, go to our smart forfour category.