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After googling it is determined Code P0420 ( Catalytic converter effeciency below threshold)
you stick some plastic explosives on it and run
P0420 = Catalyst System Efficiency Below Threshold Bank 1.Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic converter needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.
How fix code P1140
it cant be fixed just tightend your gas cap harder
How do you fix a p0420 bank 1 on a 05 dodge stratus
DTC P0420 = Catalyst System Efficiency Below Threshold (Bank 1)You can drive it but it would be wise to have the vehicle checked out as soon as possible. Putting this off could cost you more in the long run. If you have other codes preceding code P0420 fix them in order as they come up before you attempt to fix P0420.
Reset the code. If comes back check o2 sensor and cat
Replace the catalytic converterReplace the catalytic converter
Catalytic converter failure. Replace the catalytic converter.
Fix any exhaust leaks, test/replace the oxygen sensors, replace the catalytic converter.
Replace the catalytic converter.Replace the catalytic converter.