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Alfa Romeo DTC

Alfa Romeo DTC P0171

Manufacture

Alfa Romeo DTC

Code

P0171

Definition

System Too Lean (Bank 1)

Description

When the sum of the short term and long term fuel corrections are greater than a calibrated threshold, generally 133% (100% is nominal), the fail timer will increment. After 30 seconds of fail time the diagnostic fails.

Cause

  • Fuel System Issue Causing Low Fuel Pressure Or VolumeO2 Sensor Wiring IssueO2 Sensor Heater IssueO2 SensorMap SensorExhaust System LeakLeak In The Purge Flow SystemEgr Valve Internal LeakEngine Mechanical – Vacuum LeakPowertrain Control Module (Pcm)

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