p0171
Moderate
Porsche · Sedans & Sports Cars
System Too Lean Bank 1
Quick Answer
Error code P0171 on your Porsche Sedans & Sports Cars 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
Inspect intake manifold and vacuum hoses for cracks or disconnections
2
Clean or replace the mass airflow (MAF) sensor
3
Check fuel pressure with a gauge at the fuel rail
4
Inspect fuel injectors for clogging or leakage
5
Scan for additional codes and check freeze frame data
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
Vacuum hoses
Fuel injectors
Intake manifold gasket
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