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How to Bypass the Immobiliser Preventing a Ford Mondeo IV from Restarting

Model: Ford Mondeo / Fusion MK 4 - Years: 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Part: Checks and maintenance

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Video tutorial

In this video, you will learn how to resolve the immobiliser issue on a Ford Mondeo IV that has been activated due to a flat battery. Even when starting the vehicle with a booster, the immobiliser remains active.

How can you bypass this problem? Remove the positive terminal using a 10 mm spanner, then remove the earth nut located on the right, sanding away the paint (factory applied) that causes increased resistance to the power going to the negative terminal at the back.

The YouTuber can then conveniently recharge the battery overnight, but this is the method to bypass the immobiliser issue preventing the vehicle from restarting.


Updated on 1 August 2026 by ScegliAuto


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by ScegliAuto

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