p0174
Moderate
Porsche · Sedans & Sports Cars
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Porsche Sedans & Sports Cars means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Perform a smoke test on the intake system to identify vacuum leaks
2
Inspect and clean the MAF sensor with approved cleaner
3
Check fuel trim values with a scan tool at idle and under load
4
Test fuel pressure at the fuel rail
5
Inspect bank 2 fuel injectors for proper spray pattern
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 manifold gasket
Fuel injectors
Vacuum hoses
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