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P0157 Infiniti Code - HO2S22 Circuit Low Voltage

Quick Answer

The P0157 code in Infiniti vehicles indicates an issue with the HO2S22 (Heated Oxygen Sensor 2 Bank 2) circuit, specifically a low voltage reading. Common causes include Faulty HO2S22 sensor, Damaged wiring or connectors, Exhaust leaks. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0157 Infiniti indicates HO2S22 Circuit Low Voltage.
Common causes
Common causes include Faulty HO2S22 sensor, Damaged wiring or connectors, Exhaust leaks.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0157 Infiniti Description

The P0157 code in Infiniti vehicles indicates an issue with the HO2S22 (Heated Oxygen Sensor 2 Bank 2) circuit, specifically a low voltage reading. The HO2S22 sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) for optimal fuel efficiency and emissions control.

OBDII Code P0157 Infiniti - HO2S22 Circuit Low Voltage
P0157 Infiniti Code - HO2S22 Circuit Low Voltage

Common Causes of P0157 Infiniti

  1. Faulty HO2S22 sensor
  2. Damaged wiring or connectors
  3. Exhaust leaks
  4. Issues with the ECM
  5. Poor quality fuel

Symptoms of P0157 Infiniti

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling or stalling
  4. Check engine light illuminated

How to Fix P0157 Infiniti

  1. Use an OBD-II scanner to confirm the P0157 code and verify the issue.
  2. Inspect the HO2S22 sensor, wiring, and connectors for any visible damage.
  3. Test the sensor's voltage output using a multimeter to determine if it's functioning correctly.
  4. Replace the HO2S22 sensor if it's faulty, damaged, or reading low voltage.
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0157 Infiniti

The cost of repairing a P0157 code can vary depending on the specific cause of the issue. Typically, the price of a new HO2S22 sensor ranges from $50 to $200, depending on the brand and quality. Labor costs for sensor replacement can range from $100 to $300, with total repair costs averaging between $150 and $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources before proceeding with repairs.

What does this mean?

Tech Notes for P0157 Infiniti

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.

When is the Code Detected?

The P0157 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively low for an extended period of time.

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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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