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If your Ford Focus displays an "engine system fault" warning, it typically indicates a problem with the engine or its components, which can range from minor issues like a loose gas cap to more serious concerns such as sensor failures or engine misfires. It's crucial to address this warning promptly, as ignoring it can lead to further engine damage. Consider checking the vehicle’s onboard diagnostics (OBD-II) for error codes and consulting a mechanic to diagnose and resolve the issue effectively.

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5d ago

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