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P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
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Ошибка P0420. Коллектор. Обманка. — Volkswagen Polo Sedan, 1.6 л., 2014 года на DRIVE2
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Diagnose A P0420 Fault Code With Explination Bank 1 O2 Sensor Fault Engine Light - YouTube
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Tutorial to repair your OBD2 P4020 catalyst system - Otils OBD Facile
Getting Rid Of Code P0420 With A Little Spring Cleaning
