We have an Autodata scanner and we used it on a 1997 Buick Century and got the code "401" Does anyone know what this means?

Asked by Dec 13, 2014 at 03:12 PM about the 1997 Buick Century Limited Sedan FWD

Question type: Maintenance & Repair

1 Answer

945

That should be an EGR inefficiency code. Sometimes the passage between the EGR and intake becomes clogged, and that is usually the cause for the code. The operation of the EGR valve should be checked as well.

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