2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
P0420 is catalytic converter efficiency below minimum specs.
Probably time for a new cat, but have you changed anything else? it could also be a dirty O2 sensor. you can clean them with electric parts cleaner. you can also use carb/choke cleaner if you're careful
420 Hmmmmmmmmmm ?? - Not enought THC in your system
1994 Ram, 4 x 4, 230K Miles, 5.2l, 46RH Dr Evil Tranny (Street Evil),
Custom 4.5 inch lift, Bilstein 5100 series shocks, 10000lbs winch, 35x12.5x15 BFG KM2
4.88 gears, Powertrax posi rear, open front
I'll try cleaning the sensor, how do I know if it's the sensor or the cat? Or the intake gasket? I haven't done anything yet, just some banging on the muffler and it's loose inside. The cat might be too haven't hammered on that yet.
(I try to get more THC in, maybe I'll forget about that durned light! )