Engine-Codes - Infiniti - P1051 INFINITI

P1051 INFINITI - Air Fuel Ratio Sensor 1 Heater Control Circuit Low Bank 2

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1051 INFINITI Possible Causes

  • Faulty Air Fuel Ratio Sensor 1 Bank 2
  • Air Fuel Ratio Sensor 1 Bank 2 harness is open or shorted
  • Air Fuel Ratio Sensor 1 Bank 2 circuit poor electrical connection

How is the P1051 INFINITI code repair?

Start by checking 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.

Tech Notes

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

2004-2005 Infiniti FX35
2004-2005 Infiniti FX45
2004-2005 Infiniti G35 Sedan
2004-2005 Infiniti G35 Sedan
Infiniti Factory Service Bulletin OBDII Code P1051

The bulletin suggests reprogramming the Engine Control Module (ECM) first before replacing any parts.

What is the cost to diagnose the P1051 INFINITI code

Labor: 1.0

The cost to diagnose the P1051 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 code detected?

The current amperage in the heated air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. An excessively low voltage signal is sent to Engine Control Module (ECM) through the heated air fuel ratio (A/F) sensor 1 heater.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1051 INFINITI Meaning

The Engine Control Module (ECM) performs ON/OFF duty control of the Air Fuel Ratio (A/F) sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element at the specified range.

More Information

Need more information on how to fix the P1051 INFINITI code?
Get Access to Factory Service Manuals

Information for specific Infiniti models

Need more help?

Get the P1051 Infiniti code diagnosed by a professional: Find a repair shop in your area