OBDII Code List

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

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1284 INFINITI Possible Causes

  • 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 do I fix code P1284 INFINITI

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

P1284 INFINITI Tech Notes

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

There is a factory service bulletin for the following Infiniti models:

2003-2012 FX
2002 G20
2003-2006 G35 Sedan
2003-2007 G35 Coupe
2006-2012 G37 Sedan
2008-2012 G37 Coupe
2002-2004 I35
2004-2012 M
2002-2006 Q45
2002-2003 QX4
2004-2012 QX56
Infiniti Factory Service Bulletin OBDII Code P1284

Cost of diagnosing the P1284 INFINITI code

    Labor: 1.0

    The cost of diagnosing the P1284 INFINITI code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P1284 INFINITI code detected?

The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a specified period.

P1284 INFINITI Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible rough engine idle

P1284 INFINITI Meaning

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 INFINITI - Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2 - Engine-Codes.com

P1284 INFINITI More Information

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