16555/P0171/000369

16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean

Possible Causes

• Mass Air Flow Sensor (G70) defective
  
• Intake System Leak(s)

Possible Solutions

• Check Mass Air Flow Sensor (G70)
  
• Check Fuel Pressure Regulation
  
• Check Fuel Pump
  
• Check Injectors
  
• Check Intake System for Leaks
  
• Check Exhaust System for Leaks
  
• Check Secondary Air System for Leaks
  
• Check Vacuum Pipes for Leaks
  

Special Notes

• Fuel Trim Info
• TFSI - Oil leak - TFSI - Oil leak - Not a VCDS related question? or is it?