AutoCodes – Nissan – P1147 2002 Nissan Sentra

P1147 2002 Nissan Sentra Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank

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: P1147 2002 Nissan Sentra indicates Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank.
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 4,338

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 02, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1147 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 P1147 2002 Nissan Sentra - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank - AutoCodes.com — P1147 2002 Nissan Sentra Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank

What does this mean?

What are the Possible Causes of the DTC P1147 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 P1147 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 rear O2 Sensor usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1147 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 P1147 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 P1147 2002 Nissan Sentra Code

1. What are the common symptoms of OBDII code P1147 in a 2002 Nissan Sentra?

The common symptoms of code P1147 include poor fuel efficiency, engine misfires, rough idling, and a noticeable decrease in overall engine performance.

2. What does the OBDII code P1147 indicate in a 2002 Nissan Sentra?

Code P1147 indicates an issue with Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1 in a 2002 Nissan Sentra.

3. What are the possible causes of OBDII code P1147 in a 2002 Nissan Sentra?

Possible causes of code P1147 include a faulty heated oxygen sensor, issues with the sensor wiring, a vacuum leak, exhaust system leaks, or problems with the engine's air-fuel mixture.

4. How can I diagnose the OBDII code P1147 in my 2002 Nissan Sentra?

To diagnose code P1147, you can use an OBDII scanner to read the code and then inspect the heated oxygen sensor, check the sensor wiring for any damage, and look for any leaks in the exhaust system.

5. Can I drive my 2002 Nissan Sentra with OBDII code P1147?

It is not recommended to drive your vehicle with code P1147 as it can lead to further damage to the engine and decrease fuel efficiency. It is advised to address the issue promptly.

6. How can I repair OBDII code P1147 in my 2002 Nissan Sentra?

To repair code P1147, you may need to replace the faulty heated oxygen sensor, repair any damaged wiring, fix any vacuum or exhaust leaks, and ensure the air-fuel mixture is within the correct range.

7. Will resetting the OBDII code P1147 in my 2002 Nissan Sentra make it go away?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P1147 is not addressed, the code is likely to reappear.

8. How much does it cost to fix OBDII code P1147 in a 2002 Nissan Sentra?

The cost of fixing code P1147 can vary depending on the root cause of the issue. Replacing a heated oxygen sensor may cost between $150 to $300, while addressing other potential causes can increase the overall repair cost.

9. Can a DIY enthusiast repair OBDII code P1147 in a 2002 Nissan Sentra?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to repair code P1147 by following online guides and tutorials. However, if you're unsure, it's best to consult a professional mechanic.

10. How often should I check the heated oxygen sensor in my 2002 Nissan Sentra to prevent OBDII code P1147?

It's recommended to inspect and test the heated oxygen sensor during regular maintenance intervals or whenever you notice any symptoms of a failing sensor to prevent triggering code P1147 in your 2002 Nissan Sentra.