A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a car is elaborate and there are multiple factors why a light might come on. If your glow plug light comes on while driving your Subaru Impreza, it may reveal several concerns. On this page, we will do anything we can to support you see things more clearly. First, we will see how the preheating light on your Subaru Impreza operates, and then the different causes it lights up when you are driving

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What is the purpose of my Subaru Impreza glow plug light?

The primary purpose of the engine glow plug light, which is in most cases symbolized by a yellow coil, is to assure that your glow plugs are working effectively. Indeed, it must light up when you switch on your Subaru Impreza 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 motor vehicle. But, if it comes on while driving, it may indicate different issues, we will try to point out the most important ones.

What to do if the glow plug light comes on while driving on my Subaru Impreza?

A glow light that comes on while driving on your Subaru Impreza or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will check out this now. In any case, plug in your car to the diagnostic tool will allow you to precisely interpret the motive for the light up of your glow light.

My Subaru Impreza glow light comes on and I’m experiencing a loss of power

The first situation is that you identify that your glow plug light comes on while driving your Subaru Impreza and that you also experience a loss of power. In such a case, several concerns can explain its lightning. Here is a list of the most important factors:

  • Trouble of EGR valve, in reality, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this case, it is expected that your preheat light comes on while driving on Subaru Impreza because it is one of the failures of which it is intended to warn you. Have the status of your valve tested
  • Issue related to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a perturbation in the operation of the turbo.
  • Issue relevant 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 operation.
  • Finally, the last trouble that could lead to a glow indicator light on your Subaru Impreza 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 Subaru Impreza

To finish , we’ll give you the causes for a glow plug light that comes on on your Subaru Impreza without you feeling any difference in power or motor vehicle 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 trouble.
  • You have a false contact somewhere in your electrical circuit, test out the other options first because it is not easy to find it alone, we recommend you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • If you wish more tutorials on the Subaru Impreza, go to our Subaru Impreza category.