Overview on 2001 Mazda Protege P0421 - GameDay Database
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Removal and installation of front catalytic converter of 2003 How to replace the first, closest to engine, catalytic converter on a 2002 TO BUY THE SPACERS In this video i show how to Fix the dreaded My smog inspection is due on my Mitsubishi. I've been driving with a check engine light on for a few months now. P0420 and ... A customer brought me a 2003 Mercury Sable 3.0 (s vin) with the complaint of a check engine light and a lack of power. The code ...
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How to replace catalytic converter 2002 Mazda Protege
How to fix code P0421 catalyst 1 efficiency below threshold MAZDA AXELA #gariautocare
How To Fix P0421 After A Catalytic Converter Delete
Cataclean Test. Bad Catalytic Converter? Code P0420, P0421? Does It Work?
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Last Updated: August 24, 2026
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