p0171
Moderate
Acura · SUVs
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Acura SUVs 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 gaskets and hoses
2
Inspect and clean or replace the mass airflow sensor
3
Test fuel pressure with a pressure gauge
4
Replace oxygen sensor if faulty
5
Clear the code and test drive
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 or replacement sensor
Oxygen sensor
Fuel filter
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