AutoCodes – Generic – P015B

P015B Code - Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 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: P015B indicates Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 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 42,637

How popular is this code, among other codes? Medium

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 May 28, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P015B Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is greater than a calibrated value for greater than 60s.

OBDII Code P015B - Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1 - AutoCodes.com — P015B Code - Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P015B?

Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P015B?

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 Front Heated Oxygen Sensors (HO2S) usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P015B 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 P015B code?

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Information for Specific Makes

P015B Buick — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Cadillac — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Chevrolet — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Ford — Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1
P015B GMC — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Infiniti — Air Fuel Ratio Delayed Response - Lean To Rich Bank 1 Sensor 1
P015B Lexus — A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1
P015B Lincoln — Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Mercury — Oxygen Sensor Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Nissan — Air Fuel Ratio Delayed Response - Lean To Rich Bank 1 Sensor 1
P015B Pontiac — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Saturn — HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
P015B Scion — A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1
P015B Toyota — A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1

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 P015B Code

No Frequently Asked Questions about P015B Code found.

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DESHAWNisGREAT,
Date: February 8, 2017 at 5:59 pm

Be nice forskin

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IVAN
Date: September 23, 2019 at 2:08 pm

how too erase po15b code 2013 Chevy Tahoe ..I change upper 2 sensor and the engine light came up so clear it with ODB III 3 days later it came back up and remove my positive wire and it erase 3 days it came..i NEED HELP WITH THIS..

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OBDIITech
Date: September 24, 2019 at 2:12 am

Any other codes? or Exhaust leaks? Other than the Oxygen Sensor I have not seen any other component setting the P015B.

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