What is a Vacuum Leak? Diagnose & Repair Leaks in Intake System
What a vacuum leak is, its symptoms and common causes, why it triggers lean codes like P0171, and how to find and fix it with a smoke test. Includes a video and FAQs.
P0171 code means the engine is running lean (Bank 1). Common causes (often a vacuum leak), symptoms, how to diagnose it with a smoke test, and repair cost. Includes a video and FAQs.
How to diagnose an intake or vacuum leak with a smoke machine, step by step: seal the intake, introduce smoke with the engine off, and watch where it escapes. Includes a video and FAQs.