Recent content by avig70

Hello All, Mazda Protege5, 2002, 2.0L, 280,000Km. Last week I got my first P0421 fault code and also briefly P0300. Before reading this thread, that it could lead to the destruction of my CAT, I cleared the fault code and opened my OBD2 app and recorded a video of both O2 sensors, the second...