From Ross-Tech Wiki
16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean
- Mass Air Flow Sensor (G70) defective
- Intake System Leak(s)
- 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
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