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How do you troubleshoot P0401 and P0171 obdII fault codes on a 1997 Buick lesabre?
Wiki User
∙ 10y ago
p0401 is lack of egr flow
p0171 is bank 1 lean
So we have two problems that are commonly related, often accompanied by high idle that will not return to normal.
With out high idle problem you may have a pluged EGR or Vacume leak at the EGR system.
THe High idle is definately a clue that you have leak in the EGR system.
Wiki User
∙ 10y ago
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