Test Your Lean Condition P0171 / P0174 Diagnostic Skills!

For you hardcore subscribers and advanced enthusiasts who are familiar with fuel trims, O2 sensor data, and rich/lean condition diagnosis: Test your skills in this episode!
You will need a solid understanding of fuel trim data to pass the challenge so if you are a novice and need to learn about fuel trims, O2 sensors, and diagnostic procedures- or if you just want to brush up your understanding of this critical skill before taking the challenge, see this video first:
Secret of engine problem diagnosis: Fuel trims    • Secret of Engine Problem Diagnosis- F...  

Part 2 for this video (where I test viewer's ideas from the comments) is here:   • Test Your Lean P0171 / P0174 Diagnost...