Spark Plug Spark plug igniting the air-fuel mixture in the combustion chamber NPS "PK20PR-L11" - Not availableAUDI - A4, A6, A8, A5, Q5; MG - MG ZT, MG ZT- T; ROVER - 75, 45; OPEL - Vectra C; VAUXHALL - Vectra; ACURA - Legend; ...