P0171
P0171 means "System Too Lean (Bank 1)". Severity: 🟡 Moderate. You can often drive short distances, but address it promptly to avoid further damage.
What the P0171 code means
| Code | P0171 |
| Definition | System Too Lean (Bank 1) |
| System | Powertrain (engine & transmission) |
| Type | Generic (SAE standard) |
| Subsystem | Fuel & Air Metering |
| Severity | 🟡 Moderate |
Common causes of P0171
- Vacuum/intake leak
- Dirty MAF sensor
- Weak fuel pump or clogged injectors
- Failing O2 sensor
How to fix P0171
- Find and fix vacuum leaks
- Clean the MAF sensor
- Check fuel pressure and injectors
Always confirm the diagnosis with a scan tool and live data before replacing parts.
Is it safe to drive with P0171?
You can often drive short distances, but address it promptly to avoid further damage.
P0171, answered.
What does P0171 mean?
P0171 stands for "System Too Lean (Bank 1)". It is a generic (sae standard) OBD-II powertrain trouble code.
Is it safe to drive with a P0171 code?
You can often drive short distances, but address it promptly to avoid further damage.
What causes P0171?
Common causes include: Vacuum/intake leak; Dirty MAF sensor; Weak fuel pump or clogged injectors; Failing O2 sensor.
How do you fix P0171?
Typical fixes: Find and fix vacuum leaks; Clean the MAF sensor; Check fuel pressure and injectors. Always confirm the diagnosis before replacing parts.