p0171
Moderate
Buick · SUVs
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Buick SUVs 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
Scan with OBD-II to confirm P0171
2
Inspect intake manifold and fuel lines for leaks
3
Test oxygen sensor voltage readings
4
Check fuel pressure at rail
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 (optional)
Fuel pressure gauge
OBD-II scanner
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