SEAT 1J0253023X, 1J0254301S, 1J0254302L, 1J0254400CX. VW 1J0253023X, 1J0254301S, 1J0254302L, 1J0254400CX. Unique approval number for each BM part number. Type Catalytic Converter. It works by converting exhaust emissions into less harmful ones when the gasses pass through it, triggering a chemical reaction.
