Car Problem Reports

Pontiac Bonneville Check Engine Light Due to Intake Manifold Vacuum Leaks

Pontiac Bonneville Problem
2 Reports
Me Too

Model Years Affected: 2004, 2005

Engine Affected: 4.6L V8


An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary to pinpoint the cause in order to make the correct repairs. A "smoke" machine is often used to isolate the cause of difficult to find vacuum leaks.

Ask a Question