Audi a4 p0171 and p0172

VW / Audi 2.0L Turbo - System Too Lean Diagnosis & Repair P0171, P2177

VW B5: 1.8T Bank 1 system too lean (part throttle)

Dirty Mass Air Flow Sensor P0171, P0172, P0174 Codes

VW 2.0T FSI Engine... System Too Lean Fault Code P0171

Fuel Trims – Where to Begin your Diagnosis For Rich or Lean (p0171, P0172, P0174, P0175)

Audi A4 2.0T P0171 System Too Lean P2187 P2279

VW P0455 P2231 P0172 codes repair

VW and AUDI Engine code P0171 P0174 P1136 and P1138 air leak test

What Can Cause P0172/P0175 Rich DTC? (Diagnosing to Win with Fuel Trim)

P0171 System Too Lean Bank 1