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Code
P0172
Fuel / Air

Mélange trop riche — Rangée 1

Le moteur tourne avec trop de carburant ou trop peu d’air.

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Most likely causes

  1. Débitmètre MAF défectueux
  2. Filtre à air bouché
  3. Sonde à oxygène défectueuse
  4. Régulateur de pression de carburant
  5. Injecteur qui fuit

Symptoms you may notice

  • Check engine light
  • Fuel smell
  • Poor fuel economy
  • Black exhaust smoke

Checks to run

  1. Check MAF readings against spec
  2. Test fuel pressure
  3. Inspect injectors for leaks
  4. Look for stored rich-running causes

Tools you may need

OBD-II scanner Fuel pressure gauge Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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