p0171
Moderate
Volvo · Sedans & Wagons
System Too Lean Bank 1
Quick Answer
Error code P0171 on your Volvo Sedans & Wagons means: System Too Lean Bank 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Connect diagnostic scanner and read fault code
2
Inspect fuel pressure and injector spray patterns
3
Check oxygen sensor signal voltage
4
Perform fuel system pressure test
5
Scan for intake 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 injectors
Fuel pump
Mass airflow sensor
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