A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s typical, a car is complex and there are many motives why a light could come on. If your glow plug light comes on while driving your Peugeot 406, it may indicate different things. On this page, we will do everything we can to help you see things more clearly. First, we will discover how the preheating light on your Peugeot 406 operates, and then the different explanations it lights up when you are driving

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What is the goal of my Peugeot 406 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 make sure that your glow plugs are working correctly. In reality, it must light up when you switch on your Peugeot 406 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 car. Nevertheless, if it turns on while driving, it may show several troubles, we will try to point out the most important ones.

What to do if the glow plug light comes on while driving on my Peugeot 406?

A glow light that comes on while driving on your Peugeot 406 or at any other time other than when the engine is started is designed to inform you to a fault other than your spark plugs, we will take a look at this now. In any case, plug in your car to the diagnostic tool will allow you to carefully translate the cause for the light up of your glow light.

My Peugeot 406 glow light comes on and I’m having a loss of power

The first situation is that you recognize that your glow plug light comes on while driving your Peugeot 406 and that you also experience a loss of power. In such a case, different problems can explain its presence. Here is a list of the most important motives:

  • Issue of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is clogged, in such a case, it is expected that your preheat light comes on while driving on Peugeot 406 because it is one of the failures of which it is supposed to alert you. Have the status of your valve tested
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a perturbation in the operation of the turbo.
  • Problem relevant 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 functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Peugeot 406 coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel 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 406

Finally, we’ll give you the explanations for a glow plug light that comes on on your Peugeot 406 without you feeling any difference in power or car behaviour. In most cases, this is an electronic fault:

  • Glow plug relays or fuses to be changed, 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 resolve the problem.
  • You have a false contact somewhere in your electrical circuit, test the other alternatives first because it is not easy to find it alone, we advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • In the event that you have any further questions about the Peugeot 406, do not hesitate to consult our Peugeot 406 category.