AutoCodes – Nissan – P1146 2005 Nissan Sentra

P1146 2005 Nissan Sentra 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 Sentra 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 3,694

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 Sentra 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 Sentra - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 - AutoCodes.com — P1146 2005 Nissan Sentra 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 Sentra?

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 Sentra?

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 Sentra 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.

Need more information about the P1146 2005 Nissan Sentra code?

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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 Sentra Code

1. What are common symptoms of OBDII code P1146 in a 2005 Nissan Sentra?

The common symptoms of code P1146 include reduced fuel efficiency, rough idling, and the illumination of the check engine light on the dashboard.

2. What does the OBDII code P1146 on a 2005 Nissan Sentra indicate?

The code P1146 specifically refers to an issue with the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 in the vehicle's engine system.

3. What are possible causes of OBDII code P1146 in a 2005 Nissan Sentra?

Potential causes of code P1146 can include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's air-fuel mixture.

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

Diagnosing code P1146 typically involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related components, and checking for any visible signs of damage or malfunction.

5. Can I continue driving my 2005 Nissan Sentra with OBDII code P1146?

It is not recommended to continue driving with code P1146 illuminated, as it can impact the vehicle's performance and fuel efficiency. It is best to address the issue promptly.

6. How can I repair OBDII code P1146 on a 2005 Nissan Sentra?

To repair code P1146, you may need to replace the Heated Oxygen Sensor 2, repair any damaged wiring or connectors, fix exhaust leaks, or address any underlying issues affecting the air-fuel mixture.

7. Are there any DIY tips for fixing OBDII code P1146 in a 2005 Nissan Sentra?

While some basic troubleshooting like checking for loose connections or visible damage can be done DIY, it is recommended to consult a professional mechanic for a proper diagnosis and repair of code P1146.

8. Will resetting the check engine light clear OBDII code P1146 on my 2005 Nissan Sentra?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing code P1146 is not addressed, the light is likely to come back on after driving for a while.

9. How much does it cost to repair OBDII code P1146 in a 2005 Nissan Sentra?

The cost of repairing code P1146 can vary depending on the specific cause of the issue and the labor rates in your area. It's best to get a diagnostic from a mechanic to determine the exact cost.

10. Can a faulty oxygen sensor cause OBDII code P1146 in a 2005 Nissan Sentra?

Yes, a faulty oxygen sensor, particularly the Heated Oxygen Sensor 2 in Bank 1, can trigger code P1146 in a 2005 Nissan Sentra due to inaccurate readings affecting the air-fuel mixture.