P1143 Chevrolet Code - HO2S Bank 1 Sensor 3 Lean System or Low Voltage
Quick Answer
The P1143 code for Chevrolet vehicles indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 3, specifically a lean air/fuel mixture or low voltage reading. Common causes include Faulty HO2S Bank 1 Sensor 3, Vacuum leaks in the intake system, Fuel delivery issues. 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
- P1143 Chevrolet indicates HO2S Bank 1 Sensor 3 Lean System or Low Voltage.
- Common causes
- Common causes include Faulty HO2S Bank 1 Sensor 3, Vacuum leaks in the intake system, Fuel delivery issues.
- 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 P1143 Chevrolet Description
The P1143 code for Chevrolet vehicles indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 3, specifically a lean air/fuel mixture or low voltage reading. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module to adjust the fuel mixture accordingly. A lean air/fuel mixture can lead to poor engine performance, reduced fuel efficiency, and increased emissions. If not addressed promptly, it can potentially cause damage to the catalytic converter and other engine components.
Common Causes of P1143 Chevrolet
- Faulty HO2S Bank 1 Sensor 3
- Vacuum leaks in the intake system
- Fuel delivery issues
- Exhaust system leaks
- Wiring or connector issues
Symptoms of P1143 Chevrolet
- Decreased fuel efficiency
- Rough idling or stalling
- Engine misfires
- Check Engine Light illuminated
- Increased emissions
How to Fix P1143 Chevrolet
- Use an OBD-II scanner to confirm the P1143 code and diagnose the specific issue.
- Inspect the HO2S Bank 1 Sensor 3 for any damage or contamination and replace if necessary.
- Check for vacuum leaks in the intake system and repair as needed.
- Inspect the fuel delivery system for any issues and address them accordingly.
- Clear the code and perform a test drive to ensure the issue has been resolved.
Cost to Fix P1143 Chevrolet
The cost of repairing a P1143 code on a Chevrolet vehicle can vary depending on the specific cause of the issue. Generally, the price of a new HO2S sensor can range from $50 to $200, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may range from $150 to $400. It is recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model. Labor rates can vary between $80 and $150 per hour, so it's essential to consider this factor when calculating the total repair expenses.
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