Engine Running Lean? The #1 Cause (Vacuum Leak) + Fast Check @carproblemsmax

Uploaded May 2026 | Updated September 2026, 1 day ago

youtube.com/@carproblemsmax/join - Become our Sponsor Engine running lean? In this Shorts video, we cover the #1 cause of lean codes: a vacuum leak (unmetered air) that the ECU doesn’t measure. A cracked intake hose, loose clamp, leaking PCV line, or intake gasket leak can let extra air in, forcing fuel trims to spike and triggering codes like P0171 and P0174.

Engine Running Lean? The #1 Cause (Vacuum Leak) + Fast Check

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