How do you fix code p0411 on 2007 Buick Lacrosse?

Answer 1

Code P0411 on a 2007 Buick Lacrosse indicates an issue with the Secondary Air Injection System, specifically that the system is not functioning as expected. To fix this, first, check for any vacuum leaks in the hoses and ensure the air pump is operating correctly. Inspect the air injection control valve and associated wiring for damage or corrosion. If necessary, replace faulty components and clear the code to see if it reoccurs.