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Code
P1128
VW / Audi fuel trim

Trim long terme pauvre — Rangée 1 (VW)

VW : la rangée 1 est trop pauvre à long terme.

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Most likely causes

  1. Fuite de vide
  2. MAF encrassé

Symptoms you may notice

  • Check engine light
  • Rough idle
  • Poor economy

Checks to run

  1. Smoke-test the intake
  2. Clean the MAF
  3. Check fuel pressure

Tools you may need

Smoke machine MAF cleaner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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