p0171
Moderate
Alfa Romeo · Sedans & Sports Cars
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Alfa Romeo Sedans & Sports Cars means: System Too Lean (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Connect OBD-II scanner and verify code
2
Inspect oxygen sensor connector and wiring
3
Test fuel pressure at fuel rail
4
Check for vacuum leaks using smoke test
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Oxygen sensor
Fuel filter
Gaskets
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