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Replacing Engine Spark Plugs

Model: Ford Focus MK 1 - Years 1998-2004
Part: Spark plugs

Disconnect the negative terminal of the battery. Obtain a set of spark plugs identical to the originals. Using a 10 mm socket, unscrew the sealing nut of the first spark plug and pull the lead upwards. At the bottom of the well is the first spark plug. Before proceeding with removal, clean the wells thoroughly with compressed air to eliminate any dirt that could fall into the combustion chamber. Using the appropriate spark plug socket, which has a rubber gripping device, insert it gently onto the spark plug head and unscrew it. Be careful not to drop any foreign objects into the well. Replace the spark plug with one of the same model, carefully inserting it into the well, always using the appropriate socket and turning it gently to ensure it screws in correctly. If you feel resistance, remove it and try again. Spark plugs should be tightened with a torque wrench; if you do not have one, tighten without overdoing it. Proceed with the same operation for the other spark plugs.

Updated on 7 February 2026 by ScegliAuto

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