P1138 Chevrolet Code - HO2S Circuit High Voltage Sensor 2
Quick Answer
The P1138 Chevrolet code indicates a problem with the HO2S (Heated Oxygen Sensor) Circuit High Voltage Sensor 2. Common causes include Faulty HO2S sensor, Damaged wiring or connectors, Vacuum leak in the intake system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1138 Chevrolet indicates HO2S Circuit High Voltage Sensor 2.
- Common causes
- Common causes include Faulty HO2S sensor, Damaged wiring or connectors, Vacuum leak in the intake system.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1138 Chevrolet Description
The P1138 Chevrolet code indicates a problem with the HO2S (Heated Oxygen Sensor) Circuit High Voltage Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. When the sensor detects a high voltage signal, it means that there is an issue with the oxygen levels in the exhaust system, which can lead to poor engine performance and increased emissions.
Common Causes of P1138 Chevrolet
- Faulty HO2S sensor
- Damaged wiring or connectors
- Vacuum leak in the intake system
- ECM malfunction
- Exhaust system leak
Symptoms of P1138 Chevrolet
- Decreased fuel efficiency
- Rough idling
- Hesitation or stalling during acceleration
- Increased emissions
- Check Engine light illuminated on the dashboard
How to Fix P1138 Chevrolet
- Diagnose the issue by using an OBD-II scanner to read the code and inspecting the HO2S sensor and related components.
- Replace the faulty HO2S sensor if necessary, ensuring it is the correct part for your vehicle.
- Check and repair any damaged wiring or connectors in the sensor circuit.
- Inspect the intake system for vacuum leaks and repair as needed.
- Clear the error code from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1138 Chevrolet
The typical repair costs for addressing a P1138 Chevrolet code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops may charge less for the same service.
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