AutoCodes – Generic – P111B

P111B Code - Mass or Volume Air Flow via O2 Sensor Too Low Bank 1

Quick Answer

The Engine Control Module (ECM) monitors the air flow reading through the O2 sensor. Common causes include Intake or Exhaust Leaks, Faulty Mass or Volume Air Flow Sensor, Mass or Volume Air Flow Sensor 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: P111B indicates Mass or Volume Air Flow via O2 Sensor Too Low Bank 1.
Common causes: Common causes include Intake or Exhaust Leaks, Faulty Mass or Volume Air Flow Sensor, Mass or Volume Air Flow Sensor 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 3,963

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 Jul 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P111B Description

The Engine Control Module (ECM) monitors the air flow reading through the O2 sensor. The ECM sets the OBDII code when the air flow is out of factory specifications.

OBDII Code P111B - Mass or Volume Air Flow via O2 Sensor Too Low Bank 1 - AutoCodes.com — P111B Code - Mass or Volume Air Flow via O2 Sensor Too Low Bank 1

What does this mean?

What are the Possible Causes of the DTC P111B?

Intake or Exhaust Leaks
Faulty Mass or Volume Air Flow Sensor
Mass or Volume Air Flow Sensor harness is open or shorted
Mass or Volume Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P111B?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P111B 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 P111B code?

Need more information on how to fix the P111B code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P111B BMW — Mass or Volume Air Flow via O2 Sensor Too Low Bank 1
P111B MINI — Mass or Volume Air Flow via O2 Sensor Too Low Bank 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.