Spark Plug Spark plug igniting the air-fuel mixture in the combustion chamber NPS "IK20" - Not availableAUDI - A4, A6, A3, S6, 80; NISSAN - Patrol III, 2; ALFA ROMEO - 156, 33; BERTONE - Freeclimber 2; MAZDA - E; ALPINA - B3, B10