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P1148 2005 INFINITI G35

P1148 2005 INFINITI G35 - Closed Loop Control Function Bank 1

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

Possible causes

  • Faulty Air Fuel Ratio Sensor 1 Bank 1
  • Air Fuel Ratio Sensor 1 Bank 1 circuit is open or shorted
  • Air Fuel Ratio Sensor 1 Bank 1 circuit electrical connection
What does this mean?

Tech notes

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

2004-2005 Infiniti G35

The bulletin suggests reprogramming the Engine Control Module (ECM) first before replacing any parts.
What does this mean?

When is the code detected?

The closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition, the closed loop control function for bank 2 does not operate even when vehicle is driving in the specified condition.

Possible symptoms

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

P1148 2005 INFINITI G35 Description

The Engine Control Module (ECM) performs ON/OFF duty control of the Air Fuel Ratio (A/F) heater corresponding to the engine operating condition to keep the temperature of Air Fuel Ratio (A/F) element at the specified range.
OBDII Code P1148 2005 Infiniti G35 - Closed Loop Control Function Bank 1 -

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Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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