P1157 GMC Code - HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
Quick Answer
The P1157 GMC code indicates that there is an issue with the HO2S (Heated Oxygen Sensor) located in Bank 2 Sensor 2 of the vehicle's exhaust system. Common causes include Faulty HO2S Bank 2 Sensor 2, Wiring or electrical issues, Vacuum leaks 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
- P1157 GMC indicates HO2S Bank 2 Sensor 2 Lean System Or Low Voltage.
- Common causes
- Common causes include Faulty HO2S Bank 2 Sensor 2, Wiring or electrical issues, Vacuum leaks 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 P1157 GMC Description
The P1157 GMC code indicates that there is an issue with the HO2S (Heated Oxygen Sensor) located in Bank 2 Sensor 2 of the vehicle's exhaust system. This sensor is responsible for monitoring the oxygen levels in the exhaust gases after they have passed through the catalytic converter. The code specifically points to a lean condition or low voltage in this sensor, which can affect the vehicle's fuel mixture and overall performance.
Common Causes of P1157 GMC
- Faulty HO2S Bank 2 Sensor 2
- Wiring or electrical issues
- Vacuum leaks in the intake system
- Fuel delivery problems
- Exhaust leaks near the sensor
Symptoms of P1157 GMC
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or misfiring
- Check engine light illuminated
- Increased emissions
How to Fix P1157 GMC
- Diagnose the issue by using a scan tool to monitor the sensor's data and check for any fault codes.
- Inspect the wiring and connections to the HO2S Bank 2 Sensor 2 for any damage or corrosion.
- Test the sensor's operation using a multimeter to check for proper voltage output.
- Replace the HO2S Bank 2 Sensor 2 if it is found to be faulty or not functioning correctly.
- Clear the fault codes and reset the ECM to allow the vehicle to recalibrate the fuel mixture.
Cost to Fix P1157 GMC
The cost of repairing a HO2S Bank 2 Sensor 2 lean system or low voltage issue can vary depending on the vehicle make and model, the location of the repair shop, and the cost of the sensor itself. On average, the cost of replacing an oxygen sensor can range from $100 to $300, with labor costs adding an additional $80 to $150 per hour. In total, the repair for this issue could range from $200 to $500, but it's best to get a specific quote from a local auto repair shop.
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