P0174
Sistema
Powertrain (Fuel/Air)
Escáner necesario
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.

Síntomas habituales

  • Rough idle
  • Poor acceleration
  • Often paired with P0171

Causas típicas

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

¿Qué escáner necesita?

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

Use datos en vivo y freeze frame antes de cambiar piezas. Códigos ABS, SRS y U suelen requerir un escáner de todos los sistemas.

Consejos de diagnóstico

  • Registre el freeze frame cuando se active el código
  • Borre el código solo tras corregir la causa
  • Revise códigos pendientes relacionados
  • Verifique que la batería esté por encima de 12,4 V antes de sospechar sensores

Escáneres FOXWELL recomendados

Preguntas frecuentes

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.