AutoCodes – Nissan – P1166 2002 Nissan Sentra

P1166 2002 Nissan Sentra Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2

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: P1166 2002 Nissan Sentra indicates Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2.
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 3,422

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 04, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1166 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 P1166 2002 Nissan Sentra - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2 - AutoCodes.com — P1166 2002 Nissan Sentra Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2

What does this mean?

What are the Possible Causes of the DTC P1166 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 P1166 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 P1166 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 P1166 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 P1166 2002 Nissan Sentra Code

1. What are the common symptoms of OBDII code P1166 on a 2002 Nissan Sentra?

- Common symptoms include reduced fuel efficiency, rough idling, and potentially an illuminated check engine light on the dashboard.

2. What does the OBDII code P1166 indicate specifically for a 2002 Nissan Sentra?

- This code signifies an issue with Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2 on the vehicle.

3. What are the possible causes of OBDII code P1166 on a 2002 Nissan Sentra?

- Possible causes may include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or a problem with the engine's air-fuel mixture.

4. How can I diagnose the root cause of OBDII code P1166 on my 2002 Nissan Sentra?

- You can use an OBDII scanner to retrieve the code and then visually inspect the oxygen sensor, wiring, and exhaust system for any visible issues.

5. Can I continue driving my 2002 Nissan Sentra with OBDII code P1166?

- It is not recommended to drive the vehicle with this code present, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair OBDII code P1166 on my 2002 Nissan Sentra?

- Repair typically involves replacing the faulty oxygen sensor, repairing any damaged wiring or connectors, and addressing any underlying issues causing the code.

7. Is it possible to reset OBDII code P1166 on a 2002 Nissan Sentra without fixing the underlying problem?

- While you can clear the code with an OBDII scanner, it is crucial to address the root cause to prevent the issue from recurring.

8. How much does it cost to repair OBDII code P1166 on a 2002 Nissan Sentra?

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

9. How often does OBDII code P1166 occur in 2002 Nissan Sentras?

- While not as common as some other codes, P1166 can still occur due to various factors affecting the oxygen sensor or related components.

10. Can a DIY enthusiast fix OBDII code P1166 on a 2002 Nissan Sentra?

- Depending on your skill level and access to tools, DIY repair is possible for some aspects of addressing this code, such as replacing the oxygen sensor.