HI talisain, Welcome to 2carpros and TY for the donation
Diagnostic Trouble Code (DTC) P0401:
Insufficient flow in the Exhaust Gas Recirculation (EGR) system.
Its either a clogged EGR valve or its defective to include a clogged intake port that will caused this insufficient flow
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Tuesday, September 7th, 2010 AT 2:04 AM