While this code (P0420) could also be from the oxygen sensor, troubleshoot the oxygen sensor using a live data code reader. I did that and found good readings on the O2 sensors and realized I have a bad cat, installation is fairly easy, slightly different than the OEM so you will need nuts and bolts compared to the OEM Cat which has built in bolts Has. You will also need 2 walker pads to do this. Less than an hour of work and no code, for more than a month. This code worked for about a year. 2004 Honda Accord EX 4 cylinder
Nokian Tires Nordman 7 175/70 R13 82T Winter
45 Review
LEDAUT T3 Titanium Turbo Blanket Thermal Cover With Fastener Springs For Enhanced Turbocharger Heat Shielding
23 Review
Vapor Canister Purge Valve Solenoid 1997278 For Chevrolet Trailblazer, Cavalier, Pontiac Bonneville, Oldsmobile - Replaces 214-641, 214-2246, 911-035 - EVAP Emission Purge Control Valve
30 Review
TOTALFLOW 646 Mini Muffler 409SS 4.5" Round Width 4" Body 6" Overall Length Inner Inlet-3.5" Outer Diameter Outlet
39 Review
Replace Car Bumper Clips: GOOACC 100Pcs For Nissan, Mazda And Infiniti, Including Fastener Remover
33 Review
25Pcs Fender Liner Screws For Toyota Avalon Camry Corolla Scion Lexus - OEM #90159-60498
35 Review
820Pcs Car Push Retainer Clips & Fasteners Assortment - Ford GM Toyota Honda Chrysler BMW Benz Nissan Subaru Audi Mazda
32 Review
Off-Road Fender Flares For Jeep Wrangler 2007-2018 JK & JKU Unlimited - Heavy Duty Flat Textured Steel Mud Guards In Black (Set Of 4) By Hikotor For Front And Rear Replacement (2 Or 4 Door Options)
47 Review