p0171
Moderate
Kia · Sedans
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Kia Sedans 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 OBD-II scanner and retrieve freeze frame data
2
Inspect mass airflow sensor for contamination
3
Check fuel pressure at fuel rail
4
Inspect oxygen sensors for proper operation
5
Check for vacuum leaks in intake system
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
MAF sensor cleaner
Related Error Codes