p0174
Moderate
Audi · Sedans
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Audi Sedans means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Scan for related codes on both banks to determine if the issue is systemic or bank-specific
2
Perform a smoke test on the intake system focusing on bank 2 vacuum lines
3
Inspect the intake boot between the MAF sensor and throttle body for cracks
4
Test fuel pressure and volume output from the fuel pump
5
Monitor bank 2 oxygen sensor data for abnormal readings
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
Intake boot
Vacuum lines
O2 sensor (bank 2)
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