DTC P0171 Alfa Romeo
System Too Lean (Bank 1)
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 and Solution
Fuel System Issue Causing Low Fuel Pressure Or Volume
O2 Sensor Wiring Issue
O2 Sensor Heater Issue
O2 Sensor
Map Sensor
Exhaust System Leak
Leak In The Purge Flow System
Egr Valve Internal Leak
Engine Mechanical – Vacuum Leak
Video Guide
Diagnostic Info
- DTC Code: P0171
- Brand: Alfa Romeo