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How to Discover if the Injectors of a Peugeot or Citroen Engine are Leaking

Model: Peugeot 107 MK 1 - Years 2005-2014
Part: Fuel injectors

In this video, you can see a very simple technique to check if the injectors of a Peugeot or Citroen engine are leaking. You only need a plastic cup and a bit of water. While the engine is running, pour a small amount of water over the injectors. As shown in the video, when you find the leaking injector, you will see a sort of jet coming from the faulty injector. Do not worry about the water entering by capillarity because the injector is no longer airtight: indeed, with the pressure from the pistons, it is impossible for anything to enter the engine. Think of car washes, especially the professionals who wash engines with pressure washers! What harm could a drop of water possibly do!

Posted on 30 January 2026 by ScegliAuto

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by ScegliAuto

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