AutoCodes – Nissan – P1284 Nissan

P1284 Nissan Code - Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2

Quick Answer

The A/F sensor is a planar dual-cell limit current sensor. Common causes include Faulty Air Fuel Ratio (A/F) Sensor 1 Bank 2, Air Fuel Ratio (A/F) Sensor 1 Bank 2 harness is open or shorted, Air Fuel Ratio (A/F) Sensor 1 Bank 2 circuit poor electrical connection. 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: P1284 Nissan indicates Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2.
Common causes: Common causes include Faulty Air Fuel Ratio (A/F) Sensor 1 Bank 2, Air Fuel Ratio (A/F) Sensor 1 Bank 2 harness is open or shorted, Air Fuel Ratio (A/F) Sensor 1 Bank 2 circuit poor electrical connection.
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.

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Code Popularity 32,917

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 28, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1284 Nissan Description

The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800 C (1,292 - 1,472 F).

OBDII Code P1284 Nissan - Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2 - AutoCodes.com — P1284 Nissan Code - Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2

What does this mean?

What are the Possible Causes of the DTC P1284 Nissan?

Faulty Air Fuel Ratio (A/F) Sensor 1 Bank 2
Air Fuel Ratio (A/F) Sensor 1 Bank 2 harness is open or shorted
Air Fuel Ratio (A/F) Sensor 1 Bank 2 circuit poor electrical connection
Low fuel pressure
Faulty Fuel injector
Intake air leaks

How to Fix the DTC P1284 Nissan?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be performed.

There is a factory service bulletin for the following Nissan models:
Nissan Altima Sedan
Nissan Altima Coupe
Nissan Armada
Nissan Frontier
Nissan Cube
Nissan Maxima
Nissan Murano
Nissan Pathfinder
Nissan Quest
Nissan Rogue
Nissan Sentra
Nissan Titan
Nissan Versa
Nissan Xterra
Nissan Factory Service Bulletin OBDII Code P1284

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1284 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1284 Nissan code?

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Information for Specific Nissan Models

P1284 2004 Nissan Maxima — Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2
P1284 2005 Nissan Maxima — Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2

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.