Instructor: Andrew Fischer

Sponsor: FACTS & WTI

Course Title: Fuel Trim Essentials

Course Description: 

In this course, you will learn the importance of interpreting fuel trim data accurately to diagnose issues such as vacuum leaks, fuel delivery problems, and sensor faults. We’ll emphasize the vital role of oxygen sensors (O2 sensors) and air-fuel ratio sensors, demonstrating how their signals directly influence fuel trim behavior and overall engine health. Using live data, you’ll explore how to identify abnormal fuel trim patterns and what they reveal about underlying system problems. You’ll develop the skills to determine whether trims are within healthy ranges or indicative of deeper issues, and how to differentiate between short-term adjustments and long-term fuel trims that have become “learned” behavior.

By understanding the interaction between oxygen sensors, air-fuel sensors, and fuel trims, you’ll be empowered to perform more accurate and efficient diagnostics, reducing guesswork and improving repair outcomes. Whether dealing with misfires, rough idling, or high emissions, mastering fuel trim analysis will become an essential tool in your technical toolkit. 

This course is designed for technicians who want to enhance their diagnostic accuracy and confidence by mastering the fundamentals of fuel trim behavior and sensor signals. Join us to unlock the secrets behind engine fueling and drive your troubleshooting skills to new heights.