P1174 – Fuel Trim Lean (Bank 1, Nissan)

Description

The ECM detected an excessively lean fuel mixture on Bank 1.

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Symptoms

  • Hesitation
  • Poor acceleration
  • Rough idle
  • High fuel consumption
  • Check engine light

Causes

  • Vacuum leak
  • Low fuel pressure
  • Faulty O2 sensor
  • MAF sensor fault
  • Injector clogging

Diagnosis

  • Check fuel trims
  • Inspect vacuum lines
  • Test fuel pressure
  • Scan live data

Repair

  • Repair vacuum leaks
  • Replace O2 sensor
  • Fix fuel pressure issue
  • Clean injectors

Related Problems

Related Fault Codes