Cadillac Seville STS Problem Report

Cadillac Seville STS Check Engine Light Due to Intake Manifold Vacuum Leaks

(12 reports)

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.

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