A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s typical, a vehicle is complex and there are many causes why a light might occur. If your glow plug light comes on while driving your Renault Megane 4, it may possibly signal several things. In the following paragraphs, we will do anything we can to help you see things more clearly. First, we will see how the preheating light on your Renault Megane 4 works, and then the different reasons it lights up when you are driving

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What is the goal of my Renault Megane 4 glow plug light?

The main role of the engine glow plug light, which is most of the time represented by a yellow coil, is to ensure that your glow plugs are working effectively. In reality, it must light up when you switch on your Renault Megane 4 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 meant to stay or come on while driving with your motor vehicle. But, if it comes on while driving, it may indicate multiple failures, we will try to detail the most important ones.

What to do if the glow plug light comes on while driving on my Renault Megane 4?

A glow light that comes on while driving on your Renault Megane 4 or at any other time other than when the engine is started is intended to warn you to a fault other than your spark plugs, we will take a look at this now. Whatever the case, plug in your car to the diagnostic tool will allow you to properly translate the cause for the light up of your glow light.

My Renault Megane 4 glow light comes on and I’m experiencing a loss of power

The first probability is that you recognize that your glow plug light comes on while driving your Renault Megane 4 and that you also encounter a loss of power. In this instance, several trouble can explain its presence. Here is a list of the most important causes:

  • Problem of EGR valve, in reality, if you are affected a loss of power, it is possible that your EGR valve is clogged, in this case, it is expected that your preheat light comes on while driving on Renault Megane 4 because it is one of the problem of which it is intended to warn you. Have the status of your valve tested
  • Issue linked 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 perturbation in the operation of the turbo.
  • Issue in connection with the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that affect its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Renault Megane 4 coupled with a loss of power, is that your fuel filter is too dirty, you should get 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 4

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Renault Megane 4 without you feeling any difference in power or motor vehicle behaviour. In most cases, this is an electronic fault:

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

    • If perhaps you have any additional questions about the Renault Megane 4, do not hesitate to consult our Renault Megane 4 category.