AutoCodes – Nissan – P1146 Nissan

P1146 Nissan 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 Nissan 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 24,485

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 May 01, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1146 Nissan 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 Nissan - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 - AutoCodes.com — P1146 Nissan Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

What does this mean?

What are the Possible Causes of the DTC P1146 Nissan?

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 Nissan?

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 Nissan 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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Need Help with the Code?

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Information for Specific Nissan Models

P1146 2002 Nissan Altima Sedan — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2003 Nissan Altima Sedan — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2004 Nissan Altima Sedan — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2005 Nissan Altima Sedan — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2006 Nissan Altima Sedan — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2004 Nissan Maxima — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2005 Nissan Maxima — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2002 Nissan Sentra — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2003 Nissan Sentra — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2004 Nissan Sentra — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2005 Nissan Sentra — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2006 Nissan Sentra — Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

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 Nissan Code

1. What are the common symptoms of OBDII code P1146 in a Nissan?

The common symptoms of code P1146 include poor fuel economy, rough idling, and a noticeable decrease in engine performance.

2. What can cause the OBDII code P1146 in a Nissan to trigger?

The OBDII code P1146 in a Nissan is typically triggered by a faulty Heated Oxygen Sensor 2, a damaged oxygen sensor wiring harness, or an issue with the sensor's connector.

3. How can I diagnose the cause of OBDII code P1146 in my Nissan?

To diagnose the cause of OBDII code P1146, you can use an OBDII scanner to retrieve the code and inspect the oxygen sensor, wiring harness, and connector for any visible damage or issues.

4. Can a dirty air filter trigger the OBDII code P1146 in a Nissan?

Yes, a dirty air filter can cause a lean air-fuel mixture, which may trigger the OBDII code P1146 due to the Heated Oxygen Sensor 2 detecting minimum voltage levels.

5. What is the role of the Heated Oxygen Sensor 2 in monitoring minimum voltage in Bank 1?

The Heated Oxygen Sensor 2 in Bank 1 is responsible for monitoring the minimum voltage levels in the exhaust system to ensure the engine is operating within optimal parameters.

6. Is it safe to continue driving with the OBDII code P1146 in a Nissan?

It is not recommended to continue driving with the OBDII code P1146 present in your Nissan, as it can lead to further engine damage and decreased fuel efficiency.

7. Can I repair the OBDII code P1146 in my Nissan myself?

If you have experience with automotive repairs and diagnostics, you may be able to repair the OBDII code P1146 in your Nissan by replacing the faulty Heated Oxygen Sensor 2 and addressing any wiring issues.

8. How much does it typically cost to repair the OBDII code P1146 in a Nissan?

The cost of repairing the OBDII code P1146 in a Nissan can vary depending on the extent of the damage and the cost of parts and labor. On average, it can range from $200 to $500.

9. Will resetting the OBDII code P1146 in my Nissan make it go away permanently?

Resetting the OBDII code P1146 in your Nissan may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem persists.

10. Can a failing catalytic converter cause the OBDII code P1146 in a Nissan?

Yes, a failing catalytic converter can lead to abnormal oxygen sensor readings, potentially triggering the OBDII code P1146 related to Heated Oxygen Sensor 2 minimum voltage monitoring in Bank 1.