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P1146 2005 Infiniti G35 Code - Heated Oxygen Sensor 2 Minimum 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: P1146 2005 Infiniti G35 indicates Heated Oxygen Sensor 2 Minimum 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 3,116

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 P1146 2005 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 P1146 2005 Infiniti G35 - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 - AutoCodes.com — P1146 2005 Infiniti G35 Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

What does this mean?

What are the Possible Causes of the DTC P1146 2005 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 P1146 2005 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 P1146 2005 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 P1146 2005 Infiniti G35 Code

1. What are the common symptoms of OBDII code P1146 on a 2005 Infiniti G35?

The common symptoms include poor fuel economy, rough idling, and hesitation during acceleration.

2. What can cause the OBDII code P1146 on a 2005 Infiniti G35?

The code P1146 is typically triggered by a malfunction in the Heated Oxygen Sensor 2, which results in minimum voltage monitoring issues in Bank 1 of the engine.

3. How can I diagnose the OBDII code P1146 on my 2005 Infiniti G35?

Diagnosing the code P1146 involves using an OBDII scanner to retrieve the specific fault code and then inspecting the Heated Oxygen Sensor 2 and its wiring for any signs of damage or malfunction.

4. Can a faulty Heated Oxygen Sensor 2 be repaired, or does it need to be replaced?

In most cases, a faulty Heated Oxygen Sensor 2 will need to be replaced as it is a critical component for monitoring and adjusting the air-fuel mixture in the engine.

5. Are there any DIY repair tips for fixing the OBDII code P1146 on a 2005 Infiniti G35?

DIY repair tips for resolving the P1146 code may include checking and cleaning the sensor connections, inspecting for any exhaust leaks, and ensuring proper installation of the sensor.

6. How important is it to address the OBDII code P1146 promptly?

It is essential to address the OBDII code P1146 promptly as ignoring it can lead to reduced engine performance, increased emissions, and potential damage to other engine components over time.

7. Can driving with the OBDII code P1146 on a 2005 Infiniti G35 cause any further damage?

Continuing to drive with the P1146 code can potentially cause damage to the catalytic converter and other emission control systems in the vehicle.

8. What is the typical cost to repair the OBDII code P1146 on a 2005 Infiniti G35?

The cost of repairing the OBDII code P1146 can vary depending on the extent of the issue, but it may involve replacing the Heated Oxygen Sensor 2, which can range from $100 to $300 including labor costs.

9. Can resetting the OBDII code P1146 on a 2005 Infiniti G35 make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P1146 code is not addressed, it is likely to reappear.

10. How long does it take to repair the OBDII code P1146 on a 2005 Infiniti G35?

The repair time for the P1146 code can vary depending on the exact cause of the issue and the availability of parts, but it typically takes a few hours to complete the repair.