Posts Tagged: Hyundai rough idle fix

Hyundai P2187 Code Fix: Step-by-Step Diagnosis Guide

Common Causes of a Hyundai P2187 Code Quick Summary The Hyundai P2187 code is defined as: System Too Lean at Idle (Bank 1). That means the engine is running too lean at idle (Bank 1). In other words, there’s too much air or not enough fuel when the engine is idling. In my experience, this code is almost always caused by a vacuum leak, unmetered air, or a fuel delivery issue, not a failed sensor. Most common causes: • Vacuum leaks (top cause) • Cracked hoses • Leaking intake manifold gasket • PCV hose … Read More