A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, a vehicle is complex and there are many motives why a light might come on. If your glow plug light comes on while driving your Peugeot 407, it may point out several concerns. In the following paragraphs, we will do everything we can to support you see things more clearly. First, we will see how the preheating light on your Peugeot 407 operates, and then the different causes it lights up when you are driving

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What is the goal of my Peugeot 407 glow plug light?

The primary goal 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 properly. Indeed, it must light up when you switch on your Peugeot 407 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 automobile. Nevertheless, if it comes on while driving, it may show multiple troubles, we will try to detail the most important ones.

What to do if the glow plug light comes on while driving on my Peugeot 407?

A glow light that comes on while driving on your Peugeot 407 or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will look at this right now. No matter the reason, plug in your car to the diagnostic tool will allow you to accurately translate the reason for the light up of your glow light.

My Peugeot 407 glow light comes on and I’m experiencing a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Peugeot 407 and that you also encounter a loss of power. In such a case, several trouble can describe its presence. Here is a list of the most important motives:

  • Problem of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is blocked, in this case, it is logical that your preheat light comes on while driving on Peugeot 407 because it is one of the issue of which it is meant to alert you. Have the status of your valve checked
  • 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 malfunctioned by filings or other possible foreign bodies that disrupt its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Peugeot 407 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 Peugeot 407

To conclude, we’ll give you the causes for a glow plug light that comes on on your Peugeot 407 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 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 solve the issue.
  • You have a false contact somewhere in your electrical circuit, test out the other solutions first because it is not easy to find it alone, we encourage you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Peugeot 407, take a look at the Peugeot 407 category.