p0171
Moderate
Fiat · Cars
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Fiat 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 to read the code
2
Inspect fuel system pressure using fuel pressure gauge
3
Check oxygen sensor voltage with multimeter
4
Examine intake manifold for vacuum leaks
5
Clear code and perform test drive to verify
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
Engine cleaner
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