p0171
Moderate
SEAT · SUVs & Crossovers
System Too Lean Bank 1
Quick Answer
Error code P0171 on your SEAT SUVs & Crossovers 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
Scan for additional codes and freeze frame data to identify operating conditions
2
Inspect intake manifold gaskets, vacuum hoses, and PCV valve for leaks using a smoke test
3
Clean or replace the MAF sensor and check for contamination
4
Test fuel pressure at the fuel rail and compare to specification
5
Check oxygen sensor readings for proper switching behavior
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
Intake manifold gasket
Fuel filter
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