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P1147 2003 Infiniti G35 Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1

Quick Answer

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. Common causes include Faulty heated oxygen (O2) sensor 2 (rear), Intake air leaks, Heated oxygen (O2) sensor 2 (rear) harness is open or shorted. 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: P1147 2003 Infiniti G35 indicates Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1.
Common causes: Common causes include Faulty heated oxygen (O2) sensor 2 (rear), Intake air leaks, Heated oxygen (O2) sensor 2 (rear) harness is open or shorted.
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 5,076

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 Apr 01, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1147 2003 Infiniti G35 Description

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.

OBDII Code P1147 2003 Infiniti G35 - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1 - AutoCodes.com — P1147 2003 Infiniti G35 Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1

What does this mean?

What are the Possible Causes of the DTC P1147 2003 Infiniti G35?

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 to Fix the DTC P1147 2003 Infiniti G35?

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

Replacing the O2 Sensor 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1147 2003 Infiniti G35 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.

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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.

Frequently Asked Questions about P1147 2003 Infiniti G35 Code

1. What does OBDII code P1147 on a 2003 Infiniti G35 mean?

This code indicates an issue with Heated Oxygen Sensor 2 Maximum Voltage Monitoring on Bank 1.

2. What are common symptoms of OBDII code P1147 in a 2003 Infiniti G35?

Common symptoms may include poor fuel efficiency, hesitation during acceleration, and the illumination of the Check Engine Light.

3. What are possible causes of OBDII code P1147 in a 2003 Infiniti G35?

Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's fuel system.

4. How can I diagnose the cause of OBDII code P1147 in my 2003 Infiniti G35?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related components, and performing tests to identify the root cause.

5. Can I continue driving my 2003 Infiniti G35 with OBDII code P1147?

It is not recommended to continue driving with this code unresolved, as it can lead to poor engine performance and potentially cause damage over time.

6. How can I repair OBDII code P1147 on a 2003 Infiniti G35?

Repair options may include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or addressing fuel system issues.

7. Is it possible to reset OBDII code P1147 on a 2003 Infiniti G35 without fixing the underlying issue?

While you can clear the code with an OBDII scanner, the Check Engine Light is likely to re-illuminate if the root cause is not addressed.

8. How much does it cost to fix OBDII code P1147 on a 2003 Infiniti G35?

The cost of repairs can vary depending on the specific issue, but it may range from a few hundred to a thousand dollars including parts and labor.

9. Can a DIY enthusiast fix OBDII code P1147 on a 2003 Infiniti G35?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to tackle this repair, especially if it involves basic tasks like replacing the oxygen sensor.

10. How often does OBDII code P1147 occur in a 2003 Infiniti G35?

The occurrence of this code can vary, but it is not uncommon in older vehicles like the 2003 Infiniti G35 with high mileage or issues related to the oxygen sensor.