Recruiter's Glossary

Examples: Timing Chain • Direct Injection • DTC

AFR

Term from Automotive Maintenance industry explained for recruiters

AFR, which stands for Air-Fuel Ratio, is a fundamental measurement in automotive maintenance and repair. It tells mechanics how well a vehicle's engine is mixing air and fuel for proper operation. Think of it like a recipe - just as you need the right mix of ingredients for a cake, an engine needs the correct balance of air and fuel to run efficiently. Mechanics use AFR sensors and tools to check and adjust this balance, which affects everything from the car's performance to its fuel economy and emissions.

Examples in Resumes

Diagnosed and repaired vehicle performance issues using AFR testing equipment

Calibrated Air-Fuel Ratio sensors on various vehicle makes and models

Led team training sessions on proper AFR diagnostic techniques and adjustments

Typical job title: "Automotive Technicians"

Also try searching for:

Automotive Technician Auto Mechanic Vehicle Diagnostic Specialist Emissions Specialist Engine Performance Specialist Powertrain Technician

Where to Find Automotive Technicians

Professional Organizations

Online Forums

Job Resources

Example Interview Questions

Senior Level Questions

Q: How would you diagnose a vehicle with incorrect AFR readings affecting performance?

Expected Answer: A senior technician should explain a systematic approach: checking sensor readings, testing oxygen sensors, examining fuel pressure, checking for vacuum leaks, and using diagnostic equipment to identify the root cause. They should also mention the importance of checking service bulletins and common make/model-specific issues.

Q: How do you train junior technicians on proper AFR diagnostics?

Expected Answer: Should demonstrate teaching methodology, explaining how they break down complex concepts into simple steps, emphasize safety procedures, and provide hands-on training with diagnostic equipment. Should mention the importance of understanding both basic principles and advanced troubleshooting.

Mid Level Questions

Q: What are the common causes of AFR sensor failures?

Expected Answer: Should be able to list major causes like contamination, electrical issues, exhaust leaks, and explain basic diagnostic procedures for each scenario. Should also mention preventive maintenance practices.

Q: How does AFR affect vehicle emissions and fuel economy?

Expected Answer: Should explain the relationship between proper air-fuel mixture and vehicle performance, including how incorrect ratios can lead to poor fuel economy and failed emissions tests.

Junior Level Questions

Q: What is the ideal AFR for a gasoline engine?

Expected Answer: Should know that the ideal ratio is approximately 14.7:1 for gasoline engines and be able to explain what happens when the mixture is too rich or too lean.

Q: What basic tools do you use to measure AFR?

Expected Answer: Should be familiar with basic diagnostic tools like scan tools and exhaust gas analyzers, and understand how to read and interpret basic AFR sensor data.