P1174
System
Powertrain (Fuel/Air)
Scanner som krävs
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.

Vanliga symptom

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

Typiska orsaker

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

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade FOXWELL-scannrar

Vanliga frågor

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.