it cant be fixed just tightend your gas cap harder
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.
The P0449 code on a 2001 Cadillac Seville indicates an issue with the evaporative emission control system, specifically the vent control circuit. To fix this, first inspect the vent solenoid and wiring for any damage or disconnections. If the solenoid is faulty, replace it, and ensure all hoses connected to the evaporative system are secure and free of leaks. Clearing the code after repairs and conducting a smoke test can help confirm that the issue is resolved.
by getting a Bars Leakradiator leak at walmart
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.
How do you fix a p0420 bank 1 on a 05 dodge stratus
Catalytic converter failure. Replace the catalytic converter.
Reset the code. If comes back check o2 sensor and cat
Replace the catalytic converterReplace the catalytic converter
At a dealer... 60 for the belt, about 100 to put it on
Fix any exhaust leaks, test/replace the oxygen sensors, replace the catalytic converter.