A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s typical, a vehicle is complex and there are many reasons why a light may occur. If your glow plug light comes on while driving your Renault Megane 3, it might suggest some issues. On this page, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Renault Megane 3 functions, and then the different explanations it lights up when you are driving

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What is the role of my Renault Megane 3 glow plug light?

The main purpose of the engine glow plug light, which is generally represented by a yellow coil, is to make sure that your glow plugs are working properly. In reality, it must light up when you switch on your Renault Megane 3 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 automobile. Nevertheless, if it comes on while driving, it may suggest several failures, we will try to describe the main ones.

What to do if the glow plug light comes on while driving on my Renault Megane 3?

A glow light that comes on while driving on your Renault Megane 3 or at any other time other than when the engine is started is intended to notify you to a problem other than your spark plugs, we will look at this right now. No matter the reason, a switch to the diagnostic tool will allow you to carefully understand the motive for the light up of your glow light.

My Renault Megane 3 glow light comes on and I’m going through a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Renault Megane 3 and that you also knowledge a loss of power. In such a case, some trouble can explain its presence. Here is a list of the main reasons:

  • Problem of EGR valve, indeed, if you suffer 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 Renault Megane 3 because it is one of the failures of which it is expected to notify you. Have the status of your valve checked out
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a disturbance in the performance of the turbo.
  • Trouble 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 functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Renault Megane 3 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 Renault Megane 3

Finally, we’ll give you the explanations for a glow plug light that comes on on your Renault Megane 3 without you feeling any difference in power or automobile behaviour. Generally, this is an electronic problem:

  • 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 problem.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives first because it is not easy to find it alone, we suggest you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • If you wish more tutorials on the Renault Megane 3, go to our Renault Megane 3 category.