Catalytic Converter Replacement in Vantaa

When a catalytic converter needs replacing

A catalytic converter changes harmful exhaust gases (carbon monoxide, hydrocarbons and nitrogen oxides) into harmless compounds using a precious-metal honeycomb structure. Over its lifetime the internal element can melt if there is unburnt fuel in the exhaust (faulty ignition), clog up with soot and ash, or be mechanically broken by an impact. Catalytic converter theft has also become common in Finland — a bare pipe in place of the converter produces an earth-shattering noise and won't pass the MOT. A converter fault usually shows up as reduced engine performance, increased fuel consumption and an engine warning light with codes P0420 or P0430 (efficiency below threshold). A typical MOT fail comes from elevated CO or HC readings. Before fitting a new catalytic converter, however, we always run diagnostics — often the real fault is in the lambda sensor upstream of the converter or in the combustion inside the engine, not in the converter itself.