Engine-Codes - Infiniti - P1147 2004 INFINITI G35

P1147 2004 INFINITI G35 Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1

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

|P1147 2004 INFINITI G35 code possible causes

  • Faulty heated oxygen (O2) sensor 2 (rear)
  • Intake air leaks
  • Heated oxygen (O2) sensor 2 (rear) harness is open or shorted
  • Heated oxygen (O2) sensor 2 (rear) circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors

|How is the P1147 2004 INFINITI G35 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.

|P1147 2004 INFINITI G35 code tech notes

Replacing the O2 Sensor 2 usually takes care of the problem

|What is the cost to diagnose the P1147 2004 INFINITI G35 code

Labor: 1.0

The cost to diagnose the P1147 2004 INFINITI G35 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1147 2004 INFINITI G35 code detected?

The P1147 code is triggered when the maximum voltage from the sensor is not reached to the specified voltage.

|What are P1147 2004 INFINITI G35 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible high fuel consumption
  • Possible excessive smoke from exhaust

|What is P1147 2004 INFINITI G35 code meaning?

The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

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