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Tag: 420
| # | Post Title | Date | User |
| P0420 after driving low on gas | 3 years ago | Aibek | |
| Would Oil in the tube, leaking valve cover cause a P0420? | 3 years ago | samatista | |
| Should I replace the catalytic converter | 3 years ago | Dharmaboy | |
| P0420 Code on 2008 Camry v6 | 3 years ago | Minh Mai | |
| Rough Idle + Codes | 3 years ago | Display Name | |
| P0420/30 after replacing cat converters | 3 years ago | eetf1 | |
| Honda Ridgeline 2008 P0420 Code after extremely cold weather | 3 years ago | DuaneYYC | |
| P0420 engine code 2002 Civic | 3 years ago | Bcagle85 | |
| Car for my teenage son | 3 years ago | TuaLaoch | |
| How do I fix P0420 Catalyst System Efficiency Below Threshold | 3 years ago | grepok | |
| Elusive Ecoboost P0420 | 3 years ago | fatgroundhog | |
| Car misfire? | 3 years ago | Andy2004 | |
| Should I replace my cat | 3 years ago | ZanethC | |
| 06' Corolla with whirring noise and P0171 code | 4 years ago | sr502 | |
| stuck in open loop | 4 years ago | FlashBack | |
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