Ford Focus models are equipped with production single pole spark plugs (model number "9S7E-12405-AA"). From the appearance, the threaded part of the spark plug used by Focus is shorter than that of Mondeo, and the two spark plugs cannot be used interchangeably. The replacement cycle of spark plugs is 35,000 kilometers, and the number of replacements at a time is 4 pieces.
Generally speaking, most cars have spark plugs exposed on the outside of the engine (except some high-end cars). As long as you open the protective plate of the engine and pull out the high-voltage line connected to it, the spark plug will be exposed. Disassembling the spark plug by yourself still requires some common sense. First, use a professional hex socket wrench to remove the spark plug. Keep the outside oil out of the cylinder, then follow the principle of vertical disassembly and assembly to tighten the spark plug, in fact, another benefit of changing the spark plug yourself is that you can find the fault in the car early. Regular maintenance parts for the Focus are relatively cheap, and there are no particularly expensive parts, making the Focus less expensive to maintain.
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