A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, an automobile is complex and there are various factors why a light might occur. If it turns out your glow plug light comes on while driving your smart fortwo, it might signify different problems. In the following paragraphs, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your smart fortwo functions, and then the different explanations it lights up when you are driving

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What is the purpose of my smart fortwo glow plug light?

The primary intent of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to ensure that your glow plugs are working effectively. Indeed, it must light up when you switch on your smart fortwo 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 supposed to stay or come on while driving with your motor vehicle. However, if it comes on while driving, it may reveal different issues, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my smart fortwo?

A glow light that comes on while driving on your smart fortwo or at any other time other than when the engine is started is designed to notify you to a fault other than your spark plugs, we will check out this right now. Whatever the case, a switch to the diagnostic tool will allow you to accurately interpret the cause for the light up of your glow light.

My smart fortwo glow light comes on and I’m going through a loss of power

The first situation is that you identify that your glow plug light comes on while driving your smart fortwo and that you also experience a loss of power. In this instance, different concerns can demonstrate its presence. Here is a list of the main factors:

  • Trouble of EGR valve, in reality, if you go through a loss of power, it is possible that your EGR valve is blocked, in such a case, it is obvious that your preheat light comes on while driving on smart fortwo because it is one of the problem of which it is meant to warn you. Have the status of your valve tested
  • Trouble 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 operation of the turbo.
  • Trouble related to the injection, either an injector that has seized up or the injection pump that is destroyed 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 smart fortwo 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 smart fortwo

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

  • Glow plug relays or fuses to be swapped out, 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 get rid of 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 advise you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

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