2002 dodge ram van just failed insp because of p0420 below threshold bank 1 light stays on no leaks in cat or exhaust it looks good. Any advise? Thanks Ed #50 - Edward Nugent - 08/04/2010 - 12:45P0420 code fix if all else fails I had the same code P0420 bank 1 efficiency on...
1999 Dodge P0305 recurring codeI have a1999 Dodge 3500 Ram Van Motorhome conversion . Over the last 4 months a recurring # 5 cylinder misfire ... With occasional ruff idle & part throttle stumble .. Checked engine compression .. All cylinders within 5 P.S.I. Replaced with high quality ...