p0171
Moderate
Lincoln · SUVs
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Lincoln SUVs 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
Check for intake air leaks using smoke test
2
Test oxygen sensors with scan tool
3
Measure fuel pressure at fuel rail
4
Inspect fuel injectors for clogs
5
Clean or replace MAF sensor if necessary
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 O2 sensor
Fuel injector cleaner or replacement injectors
Fuel filter
MAF sensor
Related Error Codes