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Why would a vehicle fail an OBD II test?

fail ii OBD Test vehicle
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Why would a vehicle fail an OBD II test?

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Malfunctioning catalytic converter Faulty gas cap Fuel system malfunction Incorrect ignition timing Malfunctioning air injection system Misrouted vacuum lines Contaminated engine oil Faulty positive crankcase ventilation (PCV) system or exhaust gas re-circulation (EGR) system

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