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DTC P0420 OR P0430: 3-WAY CATALYST (TWC) FUNCTION Infiniti Q45 II

Testing & Diagnostics
DTCDefinition
P0420Left Bank TWC Malfunction
P0430Right Bank TWC Malfunction

DTC P0420 OR P0430 IDENTIFICATION

Note. Using the following diagnostic procedure assumes the presence of a current (hard) DTC or the ability to duplicate the setting of the DTC using described procedures (see DTC CONFIRMATION), conducting a test drive under conditions stored in freeze frame data or intermittent recreation procedures. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in TESTS W/CODES - INTRODUCTION article. If DTC cannot be duplicated, proceed to TESTS W/O CODES article for diagnosis by symptom.

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