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P1157 Ford Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean

Quick Answer

The P1157 diagnostic trouble code for Ford vehicles specifically refers to a lack of heated oxygen sensor switches in Bank 2 Sensor 2, indicating a lean air-fuel mixture. Common causes include Faulty oxygen sensor, Damaged wiring or connectors, 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 Ford indicates Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean.
Common causes
Common causes include Faulty oxygen sensor, Damaged wiring or connectors, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1157 Ford Description

The P1157 diagnostic trouble code for Ford vehicles specifically refers to a lack of heated oxygen sensor switches in Bank 2 Sensor 2, indicating a lean air-fuel mixture. This means that the oxygen sensor located downstream of the catalytic converter on the second bank of cylinders is not providing the expected feedback to the engine control module (ECM) regarding the oxygen levels in the exhaust gases. This can lead to a situation where the engine is running too lean, meaning there is too much air and not enough fuel in the combustion mixture.

OBDII Code P1157 Ford - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean
P1157 Ford Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean

Common Causes of P1157 Ford

  1. Faulty oxygen sensor
  2. Damaged wiring or connectors
  3. Vacuum leaks in the intake system
  4. Exhaust leaks near the oxygen sensor
  5. ECM malfunction

Symptoms of P1157 Ford

  1. Rough engine idle or misfiring
  2. Decreased fuel efficiency
  3. Reduced engine power and acceleration
  4. Illumination of the Check Engine Light
  5. Increased emissions output

How to Fix P1157 Ford

  1. Diagnose the issue by using a scan tool to retrieve the specific trouble code and inspecting the oxygen sensor and related components.
  2. Test the oxygen sensor using a multimeter to check for proper voltage output.
  3. Repair any wiring or connector issues found during the inspection.
  4. Replace the oxygen sensor if it is faulty or not providing accurate readings.
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1157 Ford

The cost of repairing a P1157 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing an oxygen sensor can cost between $100 to $300, including parts and labor. Additional costs may apply if there are wiring or connector issues that need to be addressed. It's advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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Information for Specific Ford Models

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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