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P167B Mazda Code - Fuel Injection Amount Learning Not Completed In Fuel Injection System

Quick Answer

The P167B code indicates that the Powertrain Control Module (PCM) has detected an issue with the Fuel Injection System, specifically that the fuel injector injection amount correction process has not been completed. Common causes include Fuel injector injection amount correction is not completed, Faulty Powertrain Control Module (PCM), PCM 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
P167B Mazda indicates Fuel Injection Amount Learning Not Completed In Fuel Injection System.
Common causes
Common causes include Fuel injector injection amount correction is not completed, Faulty Powertrain Control Module (PCM), PCM 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.
What is this?
Table of contents Created and updated by William Orellana on Jan 26, 2026
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Code P167B Mazda Description

The P167B code indicates that the Powertrain Control Module (PCM) has detected an issue with the Fuel Injection System, specifically that the fuel injector injection amount correction process has not been completed. This process is crucial for ensuring that the engine receives the correct amount of fuel for optimal combustion and performance. The PCM relies on various sensors to monitor engine parameters and adjust the fuel injection accordingly. If the injection amount correction is incomplete, it can lead to improper fuel delivery, which may result in poor engine performance, increased emissions, and reduced fuel efficiency.
OBDII Code P167B Mazda - Fuel Injection Amount Learning Not Completed In Fuel Injection System
P167B Mazda Code - Fuel Injection Amount Learning Not Completed In Fuel Injection System

Common Causes of P167B Mazda

  1. Fuel injector injection amount correction is not completed
  2. Faulty Powertrain Control Module (PCM)
  3. PCM harness is open or shorted
  4. PCM circuit poor electrical connection
  5. Malfunctioning fuel injectors or fuel delivery system issues

Symptoms of P167B Mazda

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased fuel efficiency and increased fuel consumption
  3. Rough idling or engine misfires
  4. Stalling or difficulty starting the engine
  5. Increased emissions or failure of emissions tests

How to Fix P167B Mazda

  1. Perform a thorough diagnostic scan to confirm the P167B code and check for any additional codes.
  2. Inspect the PCM harness and connectors for signs of damage, corrosion, or poor connections.
  3. Test the fuel injectors for proper operation and ensure they are delivering the correct amount of fuel.
  4. If necessary, reprogram or replace the PCM to restore proper fuel injection learning functionality.
  5. Clear the codes and conduct a test drive to verify that the issue has been resolved and the fuel injection system is functioning correctly.

Cost to Fix P167B Mazda

The cost to diagnose and repair the P167B code can vary significantly based on the specific issue and the make and model of the vehicle. Typical repairs may range from $100 to $500, depending on whether it involves simple wiring repairs or more complex PCM replacement. Labor rates generally fall between $80 and $150 per hour, with dealerships often charging more than independent shops. It's essential to consider location and vehicle specifics, as these factors can influence the overall repair costs.

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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.

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