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How to reset the ECU on a Ford Focus MK1

Model: Ford Focus MK 1 - Years 1998-2004
Part: Warning light – error code

In this brief guide, you will learn how to reset the control unit on a first-generation Ford Focus using the following instructions. First, open the bonnet of your car and obtain a 10 mm socket or star key; then, undo the two battery terminals (positive and negative), as shown in the video. This will disconnect the ECU from the power supply, effectively performing a reset. After a couple of minutes, reconnect the battery and start the engine.

Updated on 28 April 2026 by ScegliAuto

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