A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s typical, an auto is complicated and there are various causes why a light may occur. If it turns out your glow plug light comes on while driving your Toyota Yaris 3, it may possibly reveal several concerns. On this page, we will do anything we can to support you see things more clearly. First, we will discover how the preheating light on your Toyota Yaris 3 works, and then the different explanations it lights up when you are driving

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What is the purpose of my Toyota Yaris 3 glow plug light?

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to ensure that your glow plugs are working properly. In fact, it must light up when you switch on your Toyota Yaris 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 car. But, if it comes on while driving, it may indicate different issues, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Toyota Yaris 3?

A glow light that comes on while driving on your Toyota Yaris 3 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 look at this now. Whatever the case, plug in your car to the diagnostic tool will allow you to carefully interpret the cause for the light up of your glow light.

My Toyota Yaris 3 glow light comes on and I’m having a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Toyota Yaris 3 and that you also experience a loss of power. In this case, several trouble can describe its lightning. Here is a list of the main causes:

  • Issue of EGR valve, indeed, if you are affected 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 Toyota Yaris 3 because it is one of the failures of which it is meant to notify you. Have the status of your valve inspected
  • Problem 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 performance of the turbo.
  • Problem relevant to the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that disturb its proper function.
  • Finally, the last issue that could lead to a glow indicator light on your Toyota Yaris 3 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 Toyota Yaris 3

To conclude, we’ll give you the explanations for a glow plug light that comes on on your Toyota Yaris 3 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 issue.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we recommend you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Toyota Yaris 3, take a look at the Toyota Yaris 3 category.