Understanding Vehicle Code P0138

🚨 Check Engine Light? Code P0138 Explained! 🚗 If your vehicle has triggered a P0138 code (O2 Sensor Circuit High Voltage – Bank 1, Sensor 2), this means the downstream oxygen sensor is detecting excessive voltage, which could indicate a rich fuel mixture, faulty O2 sensor, damaged wiring, or even a failing catalytic converter. In this video, we’ll cover: ✅ What P0138 Means & Why It Happens 🔍 Common Symptoms & Causes 🛠 How to Diagnose & Fix It Step-by-Step Ignoring this issue can lead to poor fuel economy, high emissions, and potential engine damage. Watch now to learn how to diagnose and fix P0138 the right way!