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P0401 Diagnostic Trouble Code Discussion for February 2018

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1999 Toyota Tacoma Pre Runner 2.7L MIL Lamp on VIN: 4TANM92N8X
P0401: EGR System Insufficient Flow Detected. I replaced VSV on intake, it was dead when 12 volts applied. I have no vacuum from throttle body to vsv, even connecting vacuum gauge straight to port. I removed throttle body and cleaned thoroughly, blew carb cleaner and air through all the ports, they ar...
February 08, 2018