p0171
Moderate
Genesis · Sedans
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Genesis Sedans 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
Check for vacuum leaks around intake manifold and hoses
2
Inspect and clean the MAF sensor with MAF cleaner
3
Verify fuel pressure using fuel pressure gauge (40-60 PSI)
4
Clean or replace fuel injectors
5
Test oxygen sensor with scan tool
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
MAF sensor cleaner
Fuel pressure gauge
Injector cleaning kit
Replacement oxygen sensor (if needed)
Related Error Codes