AutoCodes – Nissan – P1146 2005 Nissan Altima Sedan

P1146 2005 Nissan Altima Sedan 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 Nissan Altima Sedan 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 2,933

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 2005 Nissan Altima Sedan 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 Nissan Altima Sedan - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 - AutoCodes.com — P1146 2005 Nissan Altima Sedan Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

What does this mean?

What are the Possible Causes of the DTC P1146 2005 Nissan Altima Sedan?

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 Nissan Altima Sedan?

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 Nissan Altima Sedan 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 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P1146 in a 2005 Nissan Altima Sedan?

The common symptoms of OBDII code P1146 in a 2005 Nissan Altima Sedan may include poor fuel economy, rough idling, and a decrease in engine performance.

2. What does the OBDII code P1146 for a 2005 Nissan Altima Sedan mean?

The OBDII code P1146 on a 2005 Nissan Altima Sedan indicates an issue with Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1, which is related to the oxygen sensor's performance.

3. What are the possible causes of OBDII code P1146 on a 2005 Nissan Altima Sedan?

Possible causes of OBDII code P1146 in a 2005 Nissan Altima Sedan include a faulty oxygen sensor, damaged wiring or connectors, or an issue with the vehicle's engine control module.

4. How can I diagnose the OBDII code P1146 on my 2005 Nissan Altima Sedan?

Diagnosing the OBDII code P1146 on a 2005 Nissan Altima Sedan typically involves using an OBDII scanner to retrieve the specific fault code, checking the oxygen sensor's wiring and connections, and testing the sensor's voltage output.

5. Can I drive my 2005 Nissan Altima Sedan with OBDII code P1146?

It is not recommended to drive your 2005 Nissan Altima Sedan with OBDII code P1146, as it can lead to decreased performance and potential damage to the vehicle's engine over time.

6. How do I repair OBDII code P1146 on my 2005 Nissan Altima Sedan?

Repairing OBDII code P1146 on a 2005 Nissan Altima Sedan may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, or resetting the engine control module.

7. Is it easy to replace the Heated Oxygen Sensor 2 on a 2005 Nissan Altima Sedan?

Replacing the Heated Oxygen Sensor 2 on a 2005 Nissan Altima Sedan can vary in difficulty depending on your automotive repair experience. It may require basic tools and some mechanical knowledge.

8. Can a dirty air filter cause OBDII code P1146 in a 2005 Nissan Altima Sedan?

While a dirty air filter can impact overall engine performance, it is unlikely to directly cause OBDII code P1146 in a 2005 Nissan Altima Sedan, which is specifically related to the oxygen sensor.

9. How much does it cost to repair OBDII code P1146 on a 2005 Nissan Altima Sedan?

The cost to repair OBDII code P1146 on a 2005 Nissan Altima Sedan can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

10. Can resetting the OBDII code P1146 on my 2005 Nissan Altima Sedan make it go away permanently?

Resetting the OBDII code P1146 on a 2005 Nissan Altima Sedan may clear the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.