Spark Plug Spark plug igniting the air-fuel mixture in the combustion chamber NPS "W20FS-U" - Not availableCITROËN - LNA, Xsara, ZX, Xantia; BMW - 3, 5; AUDI - A4, A6; SKODA - 100; CHEVROLET - Cruze, Aveo; ALFA ROMEO - 156; ...