P1174
Sistema
Powertrain (Fuel/Air)
Scanner richiesto
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.

Sintomi comuni

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

Cause tipiche

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

Quale scanner ti serve?

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

Usa dati live e freeze frame prima di sostituire componenti. I codici ABS, SRS e U richiedono spesso uno scanner mult sistema.

Consigli diagnostici

  • Registra il freeze frame quando il codice compare la prima volta
  • Cancella il codice solo dopo aver risolto la causa
  • Controlla i codici pending correlati
  • Verifica che la batteria sia sopra 12,4 V prima di sospettare un sensore

Scanner FOXWELL consigliati

Domande frequenti

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.