P0174
Système
Powertrain (Fuel/Air)
Scanner requis
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

System Too Lean (Bank 2)

Understand P0174, common causes, and the right FOXWELL scanner to diagnose it.

Same as P0171 but detected on bank 2 of a V-engine. Often appears together with P0171 when there is a common cause like a vacuum leak or MAF issue.

Symptômes courants

  • Rough idle
  • Poor acceleration
  • Often paired with P0171

Causes typiques

  • Vacuum leak affecting both banks
  • MAF sensor out of range
  • Fuel delivery problem
  • Exhaust leak affecting O2 readings

Quel scanner choisir ?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Utilisez les données en direct et le freeze frame avant de remplacer des pièces. Les codes ABS, SRS et U nécessitent souvent un scanner mult systèmes.

Conseils de diagnostic

  • Enregistrez le freeze frame lors de la première apparition du code
  • Effacez le code uniquement après avoir corrigé la cause
  • Vérifiez les codes en attente associés
  • Vérifiez que la batterie est au-dessus de 12,4 V avant de suspecter un capteur

Scanners FOXWELL recommandés

Questions fréquentes

Can I diagnose P0174 with a basic code reader?
P0174 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0174?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.