P0401 code

Asked by GuruLBN8Q Apr 04, 2019 at 10:38 AM about the 2000 Buick LeSabre Limited Sedan FWD

Question type: Maintenance & Repair

Got a p0401 code changed the egr, air  check
VALVE, air solenoid and clean egr pipe of any
carbons. Cleared the code after about 8 miles light
came back. On .rescanned same code P0401. Any
suggestions, frustrated!!!!!

1 Answer
2,570

Sirkut_Interrupted answered 5 years ago

First you need to find out if the egr valve is even opening. Would make sense to have a insufficient flow code if the valve isnt opening.. if you have a multi meter you can ohm the egr valve for an open circuit.. unplug the connector and itll be the two outer pins. The three middle pins are the position sensor

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