P0420 Honda - accord ex 2003

Question

Can solution be more specific

Answer 1

P0420 Catalytic below threshold Bank 1

P0325 Knock sensor 1 circuit malfunction

P2446 VTEC oil pressure switch circuit low voltage

The solution for a P0420 is to prevent the catalytic to wear out before its useful life, this mean the engine should in fuel control, no misfire, no overheating condition, no burning oil out through the exhaust system, the only fix for a P0420 is replace the catalytic convertor