P1174
Sistema
Powertrain (Fuel/Air)
Escáner necesario
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Fuel System Lean at Idle (Bank 1)

Understand P1174, common causes, and the right FOXWELL scanner to diagnose it.

Bank 1 lean condition detected specifically at idle — vacuum leak or dirty MAF common.

Síntomas habituales

  • Rough idle
  • Hesitation off idle
  • May set with P0171

Causas típicas

  • Vacuum leak at intake
  • Dirty MAF sensor
  • PCV leak
  • Low fuel pressure at idle

¿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 P1174 with a basic code reader?
P1174 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 P1174?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.