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P1166 Infiniti Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2

Quick Answer

The P1166 Infiniti code indicates an issue with the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2. Common causes include Faulty Heated Oxygen Sensor, Wiring issues, Vacuum leaks. 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
P1166 Infiniti indicates Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2.
Common causes
Common causes include Faulty Heated Oxygen Sensor, Wiring issues, Vacuum leaks.
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 P1166 Infiniti Description

The P1166 Infiniti code indicates an issue with the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2. This sensor is responsible for measuring the oxygen levels in the exhaust gases to ensure optimal fuel efficiency and emissions control. When the sensor detects a minimum voltage, it means that there is a problem with the oxygen levels in the exhaust system, which can lead to poor engine performance and increased emissions.

OBDII Code P1166 Infiniti - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2
P1166 Infiniti Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2

Common Causes of P1166 Infiniti

  1. Faulty Heated Oxygen Sensor
  2. Wiring issues
  3. Vacuum leaks
  4. Engine air-fuel ratio problem
  5. Exhaust system leaks

Symptoms of P1166 Infiniti

  1. Reduced fuel efficiency
  2. Rough idling
  3. Hesitation during acceleration
  4. Increase in emissions
  5. Check Engine Light illuminated

How to Fix P1166 Infiniti

  1. Use an OBD-II scanner to read and document the code.
  2. Inspect the Heated Oxygen Sensor and wiring for any damage or corrosion.
  3. Test the sensor's voltage with a multimeter to determine if it is functioning correctly.
  4. Replace the Heated Oxygen Sensor if it is faulty.
  5. Clear the code and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P1166 Infiniti

The typical repair costs for this issue can range from $100 to $300, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships and lower at independent shops. To obtain a more accurate estimate, it is recommended to check local rates.

What does this mean?

Tech Notes for P1166 Infiniti

Replacing the O2 Sensor 2 usually takes care of the problem

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Information for Specific Infiniti 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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