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P0151 Nissan Code - Air Fuel Ratio Circuit Low Bank 2 Sensor 1

Quick Answer

The P0151 diagnostic trouble code (DTC) for Nissan vehicles indicates an issue with the Air Fuel Ratio Circuit Low on Bank 2 Sensor 1. Common causes include Faulty oxygen sensor, Wiring issues, such as a short or open circuit, Vacuum leaks in the intake system. 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
P0151 Nissan indicates Air Fuel Ratio Circuit Low Bank 2 Sensor 1.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues, such as a short or open circuit, Vacuum leaks in the intake system.
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 08, 2024
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Code P0151 Nissan Description

The P0151 diagnostic trouble code (DTC) for Nissan vehicles indicates an issue with the Air Fuel Ratio Circuit Low on Bank 2 Sensor 1. This means that the oxygen sensor located before the catalytic converter on the second bank of the engine is reading a lower voltage signal than expected by the engine control module (ECM). The ECM uses the data from this sensor to adjust the air-fuel mixture for optimal combustion efficiency. When the sensor detects a lean air-fuel mixture, it sends a lower voltage signal to the ECM, triggering the P0151 code.

OBDII Code P0151 Nissan - Air Fuel Ratio Circuit Low Bank 2 Sensor 1
P0151 Nissan Code - Air Fuel Ratio Circuit Low Bank 2 Sensor 1

Common Causes of P0151 Nissan

  1. Faulty oxygen sensor
  2. Wiring issues, such as a short or open circuit
  3. Vacuum leaks in the intake system
  4. Exhaust system leaks
  5. Malfunctioning ECM

Symptoms of P0151 Nissan

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Check Engine Light illuminated
  5. Poor acceleration

How to Fix P0151 Nissan

  1. Diagnose the issue by performing a thorough inspection of the oxygen sensor, wiring, intake system, and exhaust system.
  2. Test the oxygen sensor's functionality using a multimeter to check for proper voltage readings.
  3. Replace the oxygen sensor if it is determined to be faulty.
  4. Repair any wiring issues or vacuum leaks that may be causing the low voltage signal.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0151 Nissan

The cost of repairing a P0151 code can vary depending on the specific cause of the issue. In general, replacing an oxygen sensor can cost between $100 and $400, including parts and labor. However, additional costs may be incurred if wiring repairs or other components need to be addressed. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain a quote from a local shop for a more accurate estimate.

What does this mean?

Tech Notes for P0151 Nissan

Replacing the Air fuel ratio (A/F) sensor 1 bank 2 usually takes care of the problem.

For Nissan models before 2005 see: P0151 Nissan

When is the Code Detected?

The Air Fuel Ratio (A/F) signal computed by Engine Control Module (ECM) from the A/F sensor 1 signal is constantly in the range other than approx. 1.5V.

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Information for Specific Nissan 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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