A new warning light on your dashboard? You don’t understand why it doesn’t turn off… It’s typical, an auto is complicated and there are multiple causes why a light may come on. If it turns out your glow plug light comes on while driving your Opel Astra 5, it may possibly indicate some issues. In this post, we will do everything we can to support you see things more clearly. First, we will see how the preheating light on your Opel Astra 5 works, and then the different explanations it lights up when you are driving

glow-plug-light-opel-astra-5

What is the goal of my Opel Astra 5 glow plug light?

The primary goal of the engine glow plug light, which is in most cases represented by a yellow coil, is to make sure that your glow plugs are working effectively. In fact, it must light up when you switch on your Opel Astra 5 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 expected to stay or come on while driving with your motor vehicle. However, if it comes on while driving, it may indicate several failures, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my Opel Astra 5?

A glow light that comes on while driving on your Opel Astra 5 or at any other time other than when the engine is started is designed to alert you to a problem other than your spark plugs, we will look at this right now. In any case, a switch to the diagnostic tool will allow you to accurately translate the motive for the light up of your glow light.

My Opel Astra 5 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 Opel Astra 5 and that you also encounter a loss of power. In this instance, some problems can demonstrate its presence. Here is a list of the main causes:

  • Problem of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is blocked, in such a case, it is logical that your preheat light comes on while driving on Opel Astra 5 because it is one of the issue of which it is designed to notify you. Have the status of your valve checked
  • Issue associated with 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 performance of the turbo.
  • Issue associated with the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disturb its proper performing.
  • Finally, the last issue that could lead to a glow indicator light on your Opel Astra 5 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 Opel Astra 5

Finally, we’ll give you the explanations for a glow plug light that comes on on your Opel Astra 5 without you feeling any difference in power or motor vehicle behaviour. Generally, this is an electronic problem:

  • Glow plug relays or fuses to be replaced, 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 fix 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 recommend you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • If you wish more guides on the Opel Astra 5, go to our Opel Astra 5 category.