2004 Lincoln LS "code p0420" Questions

2004 lincoln ls codes my car is giving me p0300 and p0420 codes. any ideas where to start? possibly cheapest first?....i know probably not p0300 is a random engine misfire and p0420 is catalytic ...

code p0420 PO420--Failed converter Bank 1 (right side/pass) www.engine-light-help.com/generic-check-engine-light-codes.html

...CAME BACK WITH P0430 P0420. DOES THIS JOB REQUIRE A MECHANIC OR IS IT EASILY REPLACED? Those codes represent bad or inert catalytic converters. Putting in new o2 sensors only costs you money. ...

...P0420 code to go away. Any help is appreciated. I own a 2004 V8 Have several hundred dollars in manuals First -If it has a 3.9V8 it has to use 91 and most likely won't run well even on 93. Second-the ...

code p0420 plugs and coils have been replaced already drives fine https://www.fixdapp.com/blog/p0420 https://www.fixdapp.com/blog/p0420 https://mechanicbase.com/trouble-code/p0420 https://mechanicbase

...code P0420 Catalyst efficiency below ... mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie... Feedback P0420 Error Code: Catalyst System Efficiency Below ... ...

...CODE P0420 CHECK ENGINE CAME AND I HAD IT CHECKED AT AUTO ZONE THE CODE INDICATED WAS P0420. VEHICLE ISN'T MISFIRING OR RUNNING BAD. P0420 isnt a misfiring code; this code P0420 is refer at ...

...code P0420 How do I fix this problem? 0 2 sensor near the catalytic converter or replace the catalytic converter The downstream O2 sensor reading should be fairly steady. Typically the P0420 code ...

...code: P0420 and will not pass emissions. Also code: P0446, I realize that the P0420 may be a 02 sensor, but I am looking for anyone that may be more specific on either one of these two error codes. ...

Engine light came on my 2011 Subaru Legacy premium. I connected the computer and got three codes. P020 PRM, P0420 PND, and P0420 CNF. Can you please let me know what they are? P0420 Catalyst System ...