Spark Plug Spark plug igniting the air-fuel mixture in the combustion chamber RIDEX "686S0307" - Not availableVOLVO - S70, V70, 850, S40, S80; AUDI - A6, A4; PEUGEOT - 405, 605; CITROËN - XM, BX; BMW - 3, 5; SKODA - Superb; VW - Passat