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    Volvo S40 1.6 2001 - MIL: on code P0420 cat converter system bank 1efficiency low # Archived Message

    Posted by Jeff Perin on December 1, 2008, 4:56 pm

    hi can any 1 help we have a 2001 s40 volvo driving us nuts customer booked in vehicle with mil light on did code read using trw id found 1 fault code p0420 cat converter system bank 1 efficiency below threshold so checked live data which pointed us to the cat so checked temp in & out of cat where we found no temp differance so replaced cat and lambda sensor vehicle run about 1 week mil come back on rechecked fault codes same code rechecked live data pointed towards cat again checked temps on cat no differance replaced cat & post cat lambda senser this time road tested for many miles no light customer has now run 4 days light come back can anyone help are we missing some thing stupid ????? many thanks jeff






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