P0138 Oxygen Sensor Circuit High Voltage P0138 is a generic OBD-II powertrain code... It indicates that Bank 1 Sensor 2 oxygen sensor voltage is higher than expected. Symptoms: • Check Engine Light • Poor fuel economy • Rich fuel mixture Common Causes: • Faulty O2 sensor • Wiring damage • Fuel mixture problems • Exhaust leaks Diagnosis: 1. Scan live O2 sensor data 2. Inspect wiring 3. Check fuel trims 4. Test sensor response Repair Cost: $100–$400 depending on vehicle.

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