AutoCodes – Infiniti – P015D Infiniti

P015D Infiniti Code - Air Fuel Ratio Delayed Response - Lean To Rich Bank 2 Sensor 1

Quick Answer

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. Common causes include Faulty Air Fuel Ratio (A/F) Bank 2 Sensor 1, Air Fuel Ratio (A/F) Bank 2 Sensor 1 harness is open or shorted, Air Fuel Ratio (A/F) Bank 2 Sensor 1 circuit poor electrical connection. 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: P015D Infiniti indicates Air Fuel Ratio Delayed Response - Lean To Rich Bank 2 Sensor 1.
Common causes: Common causes include Faulty Air Fuel Ratio (A/F) Bank 2 Sensor 1, Air Fuel Ratio (A/F) Bank 2 Sensor 1 harness is open or shorted, Air Fuel Ratio (A/F) Bank 2 Sensor 1 circuit poor electrical connection.
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 2,678

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 12, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P015D Infiniti Description

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element. The sensor is capable of precise measurement λ = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range. The exhaust gas components diffuse through the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocarbon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this electrode layer of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of approximately 760°C (1,400°F).

OBDII Code P015D Infiniti - Air Fuel Ratio Delayed Response - Lean To Rich Bank 2 Sensor 1 - AutoCodes.com — P015D Infiniti Code - Air Fuel Ratio Delayed Response - Lean To Rich Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P015D Infiniti?

Faulty Air Fuel Ratio (A/F) Bank 2 Sensor 1
Air Fuel Ratio (A/F) Bank 2 Sensor 1 harness is open or shorted
Air Fuel Ratio (A/F) Bank 2 Sensor 1 circuit poor electrical connection

How to Fix the DTC P015D Infiniti?

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 Air Fuel Ratio Bank 2 Sensor 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P015D Infiniti 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 P015D Infiniti Code

1. What does the OBDII code P015D mean on an Infiniti?

P015D indicates "Air Fuel Ratio Delayed Response - Lean to Rich Bank 2 Sensor 1," meaning the upstream oxygen sensor on Bank 2 is not switching between lean and rich conditions as quickly as expected.

2. What are the common symptoms of a P015D code in an Infiniti?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, rough idling, hesitation during acceleration, or a noticeable drop in engine performance.

3. What causes the P015D code to appear on an Infiniti?

Common causes include a faulty oxygen sensor (Bank 2 Sensor 1), exhaust leaks, vacuum leaks, dirty or failing fuel injectors, or issues with the engine's air-fuel mixture.

4. Which sensor is affected by the P015D code on an Infiniti?

The code refers to the upstream oxygen sensor (Sensor 1) located on Bank 2, which monitors the air-fuel ratio.

5. Can a dirty mass airflow (MAF) sensor trigger the P015D code?

Yes, a dirty or malfunctioning mass airflow sensor can cause incorrect air-fuel ratio readings, potentially contributing to a delayed response from the oxygen sensor.

6. How do I diagnose the P015D code on my Infiniti?

Start by checking for exhaust or vacuum leaks, inspecting the wiring and connections to Bank 2 Sensor 1, testing the oxygen sensor's response with a scan tool, and verifying the mass airflow sensor's performance.

7. Can I drive my Infiniti with a P015D code?

While the car may remain drivable, ignoring the P015D code can lead to reduced fuel efficiency, poor performance, and potential damage to the catalytic converter over time.

8. How do you fix the P015D code on an Infiniti?

Repairs may include replacing the faulty oxygen sensor, fixing exhaust or vacuum leaks, cleaning or replacing the mass airflow sensor, or addressing fuel system issues like clogged injectors.

9. How much does it cost to fix a P015D code on an Infiniti?

Costs vary depending on the cause, but replacing the oxygen sensor typically ranges from $200 to $400, including parts and labor.

10. Can a software update resolve the P015D code on an Infiniti?

In some cases, a software update to the engine control module (ECM) may be required if the issue is related to programming errors. Consult your Infiniti dealer to check if this applies.