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

Quick Answer

The P0155 code for Nissan vehicles indicates an issue with the O2 sensor heater circuit for Bank 2 Sensor 1. Common causes include Faulty O2 sensor heater, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater circuit. 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 Nissan indicates O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 sensor heater, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater circuit.
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 11, 2024
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Code P0155 Nissan Description

The P0155 code for Nissan vehicles indicates an issue with the O2 sensor heater circuit for Bank 2 Sensor 1. The oxygen sensor, also known as the O2 sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases. This specific sensor is located in the exhaust manifold before the catalytic converter. The heater circuit in the O2 sensor is responsible for quickly bringing the sensor up to operating temperature, ensuring accurate readings.

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

Common Causes of P0155 Nissan

  1. Faulty O2 sensor heater
  2. Wiring or connector issues in the O2 sensor circuit
  3. Blown fuse related to the O2 sensor heater circuit
  4. ECM malfunction
  5. Exhaust leaks near the O2 sensor

Symptoms of P0155 Nissan

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Increased emissions
  5. Engine misfires

How to Fix P0155 Nissan

  1. Diagnose the issue by using a scan tool to confirm the P0155 code and checking the O2 sensor heater circuit for any visible damage.
  2. Inspect the wiring and connector for the O2 sensor, looking for any signs of corrosion or damage. Repair or replace as needed.
  3. Test the O2 sensor heater using a multimeter to check for continuity and proper resistance. Replace the O2 sensor if necessary.
  4. Check and replace any blown fuses related to the O2 sensor heater circuit.
  5. Clear the code from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0155 Nissan

The typical repair costs for fixing the O2 sensor heater circuit malfunction (P0155) on a Nissan vehicle can range from $150 to $400. This estimate includes the cost of a new O2 sensor if needed, labor charges, and any additional parts or materials required for the repair. It's important to note that actual costs can vary depending on the specific location, vehicle make and model, and the rates charged by auto repair shops. It's recommended to obtain quotes from multiple shops to find the best price for the repair.

What does this mean?

Tech Notes for P0155 Nissan

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)

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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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