AutoCodes – Nissan – P1146 2002 Nissan Sentra

P1146 2002 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 2002 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 2,675

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 2002 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 2002 Nissan Sentra - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 - AutoCodes.com — P1146 2002 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 2002 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 2002 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 2002 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 2002 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 2002 Nissan Sentra Code

1. What are the common symptoms of OBDII code P1146 on a 2002 Nissan Sentra?

The common symptoms may include poor fuel economy, rough idling, hesitation or stalling, and the illumination of the Check Engine Light.

2. What does OBDII code P1146 signify on a 2002 Nissan Sentra?

OBDII code P1146 indicates an issue with Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 on a 2002 Nissan Sentra.

3. What are the possible causes of OBDII code P1146 on a 2002 Nissan Sentra?

Possible causes may include a faulty heated oxygen sensor, wiring issues in the sensor circuit, a vacuum leak, or an exhaust system concern.

4. How can I diagnose the OBDII code P1146 on my 2002 Nissan Sentra?

You can diagnose the code by using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connections of the heated oxygen sensor, and checking for any exhaust leaks.

5. Can I continue driving my 2002 Nissan Sentra with OBDII code P1146?

It is not recommended to continue driving with this code as it can lead to poor engine performance and potential damage. It's best to address the issue promptly.

6. How can I repair OBDII code P1146 on my 2002 Nissan Sentra?

The repair may involve replacing the faulty heated oxygen sensor, repairing any damaged wiring, fixing vacuum leaks, or addressing any exhaust system issues.

7. Will resetting the Check Engine Light resolve OBDII code P1146 on a 2002 Nissan Sentra?

Resetting the Check Engine Light may temporarily clear the code, but it is essential to diagnose and address the underlying issue to prevent it from reoccurring.

8. How much does it typically cost to repair OBDII code P1146 on a 2002 Nissan Sentra?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast fix OBDII code P1146 on a 2002 Nissan Sentra?

Depending on your experience and tools, you may be able to replace the heated oxygen sensor yourself. However, diagnosing and repairing wiring or exhaust system issues may require professional assistance.

10. How often should the Heated Oxygen Sensor 2 be replaced on a 2002 Nissan Sentra?

The heated oxygen sensor should typically be replaced every 60,000 to 90,000 miles or as recommended in the vehicle's maintenance schedule to ensure optimal performance and fuel efficiency.