Engine-Codes.com
Engine-Codes – Infiniti – P0155 Infiniti

P0155 Infiniti Code - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1

Quick Answer

The P0155 code for Infiniti vehicles indicates a problem with the O2 sensor heater circuit in Bank 2 Sensor 1. Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring in the O2 sensor heater circuit can prevent proper voltage from reaching the sensor, Blown Fuse: A blown fuse in the O2 sensor heater circuit can disrupt the flow of electricity to the sensor. 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
P0155 Infiniti indicates O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring in the O2 sensor heater circuit can prevent proper voltage from reaching the sensor, Blown Fuse: A blown fuse in the O2 sensor heater circuit can disrupt the flow of electricity to the sensor.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0155 Infiniti Description

The P0155 code for Infiniti vehicles indicates a problem with the O2 sensor heater circuit in Bank 2 Sensor 1. The O2 sensor, also known as the oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases. This specific sensor is located in the exhaust system before the catalytic converter on the side of the engine with cylinder 2. The heater circuit in the O2 sensor is responsible for ensuring that the sensor reaches its optimal operating temperature quickly, allowing it to function efficiently.

OBDII Code P0155 Infiniti - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1
P0155 Infiniti Code - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1

Common Causes of P0155 Infiniti

  1. Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction.
  2. Wiring Issues: Damaged or corroded wiring in the O2 sensor heater circuit can prevent proper voltage from reaching the sensor.
  3. Blown Fuse: A blown fuse in the O2 sensor heater circuit can disrupt the flow of electricity to the sensor.
  4. ECM Malfunction: A malfunctioning engine control module (ECM) may not be sending the correct signals to the O2 sensor heater circuit.
  5. Exhaust Leak: An exhaust leak near the O2 sensor can affect its performance and trigger the P0155 code.

Symptoms of P0155 Infiniti

  1. Check Engine Light: The most common symptom associated with the P0155 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning O2 sensor heater circuit can lead to poor fuel efficiency, causing the vehicle to consume more fuel than usual.
  3. Rough Idling: The engine may experience rough idling or stalling due to incorrect air-fuel mixture adjustments.
  4. Hesitation or Surging: The vehicle may hesitate or surge during acceleration or while driving at a steady speed.
  5. Increased Emissions: A faulty O2 sensor can result in increased emissions, potentially causing the vehicle to fail emissions tests.

How to Fix P0155 Infiniti

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the specific code and determine that the problem is indeed with the O2 sensor heater circuit in Bank 2 Sensor 1.
  2. Inspect Wiring and Connections: Check the wiring and connections in the O2 sensor heater circuit for any damage, corrosion, or loose connections.
  3. Test O2 Sensor: Test the O2 sensor to ensure that it is functioning properly and replace it if necessary.
  4. Check Fuses: Inspect the fuses related to the O2 sensor heater circuit and replace any blown fuses.
  5. Clear Codes and Test Drive: Clear the diagnostic trouble codes (DTCs) from the ECM, then test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0155 Infiniti

The typical repair costs for addressing a P0155 code in an Infiniti vehicle can vary depending on the specific cause of the issue. In general, the cost of replacing an O2 sensor heater circuit can range from $200 to $500, including parts and labor. However, additional costs may apply if other components need to be replaced or if further diagnostics are required.

What does this mean?

Tech Notes for P0155 Infiniti

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.

When is the Code Detected?

The current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heater)

Need more information about the P0155 Infiniti code?

Need more information on how to fix the P0155 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0155 Infiniti code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P0155 Infiniti Code

No Frequently Asked Questions about P0155 Infiniti Code found.

Discuss the causes and fixes for P0155 Infiniti OBDII Code

Submit a New Comment