P1128 — Volkswagen — Long Term Fuel Trim Bank 1 System Too Lean

P1128 (Volkswagen): Long Term Fuel Trim Bank 1 System Too Lean — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Long Term Fuel Trim Bank 1 System Too Lean. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain