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Engine-Codes – Generic – P1157

P1157 Code - Air/Fuel Ratio Sensor 1 Range/Performance Problem

Quick Answer

The P1157 code indicates that there is a range or performance issue with Air/Fuel Ratio Sensor 1 in the vehicle's engine. Common causes include Faulty Air/Fuel Ratio Sensor 1, Wiring or connector issues, Exhaust leaks near the sensor. 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 indicates Air/Fuel Ratio Sensor 1 Range/Performance Problem.
Common causes
Common causes include Faulty Air/Fuel Ratio Sensor 1, Wiring or connector issues, Exhaust leaks near the sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1157 Description

The P1157 code indicates that there is a range or performance issue with Air/Fuel Ratio Sensor 1 in the vehicle's engine. This sensor is responsible for measuring the oxygen content in the exhaust gases, allowing the engine control unit to adjust the air-fuel mixture for optimal combustion. When this sensor malfunctions or fails to provide accurate readings, it can lead to poor engine performance, decreased fuel efficiency, and increased emissions.

OBDII Code P1157 - Air/Fuel Ratio Sensor 1 Range/Performance Problem
P1157 Code - Air/Fuel Ratio Sensor 1 Range/Performance Problem

Common Causes of P1157

  1. Faulty Air/Fuel Ratio Sensor 1
  2. Wiring or connector issues
  3. Exhaust leaks near the sensor
  4. Contaminated sensor due to oil or coolant leaks
  5. Engine running too rich or too lean

Symptoms of P1157

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Hesitation or lack of acceleration
  5. Engine running too lean or too rich

How to Fix P1157

  1. Use an OBD-II scanner to confirm the P1157 code and diagnose the specific issue with the Air/Fuel Ratio Sensor 1.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check for exhaust leaks near the sensor and repair them if found.
  4. Replace the Air/Fuel Ratio Sensor 1 with a new, OEM-quality sensor.
  5. Clear the trouble code from the engine control unit and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1157

The typical repair costs for a P1157 code can vary depending on the make and model of the vehicle, as well as the cost of the sensor itself. In general, replacing an Air/Fuel Ratio Sensor 1 can cost between $200 to $400, including parts and labor. However, prices can vary significantly based on the specific vehicle and location. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your individual circumstances.

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Code P1157 Information for Specific Makes

  • P1157 Acura — Air/Fuel Ratio Sensor 1 Range/Performance Problem
  • P1157 Audi — Manifold Absolute Pressure Sensor Supply Voltage
  • P1157 BMW — O2 Sensor Heater Circuit High Voltage Bank 2 Sensor 2
  • P1157 Buick — HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
  • P1157 Cadillac — HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
  • P1157 Chevrolet — HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
  • P1157 Ford — Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean
  • P1157 GMC — HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
  • P1157 Honda — Air/Fuel Ratio Sensor 1 Range/Performance Problem
  • P1157 Lincoln — Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean
  • P1157 Mazda — HO2S-12 Circuit Condition
  • P1157 Mercury — Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean
  • P1157 MINI — O2 Sensor Heater Circuit High Voltage Bank 2 Sensor 2
  • P1157 Volkswagen — Manifold Absolute Pressure Sensor Supply Voltage
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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