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DTC P0400: EGR Function: Notes

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 OVERALL FUNCTION CHECK), 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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