Subaru Forester O2 Sensor Wiring Diagrams

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Subaru forester o2 sensor wiring diagrams - code p0420 catalyst system efficiency below threshold bank 1 p0420 can be caused by bad o2 sensors a failing catalytic converter or a leak in the exhaust system see here for a step by step guide on how to diagnose and fix code p0420 this exam includes some parts all of the quizzes i offer but you may purchase separately if desired search the history of over 351 billion web pages on the inter