Spark Plug Spark plug igniting the air-fuel mixture in the combustion chamber RIDEX "686S0008" - Not availableVOLVO - S70, V70, 850, S40; AUDI - A4, A6; PEUGEOT - 405, 605; CITROËN - XM, BX; ALFA ROMEO - 156; SKODA - Superb; ...