What does code P0174 mean on a Porsche and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Porsche, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
What this code means
Same as P0171 but for bank 2. The engine is running too lean on the side that contains cylinder 2.
Common causes for your Porsche
- Vacuum leaks affecting bank 2
- Faulty MAF or O2 sensor
- Fuel delivery issues
Symptoms
- Check Engine Light
- Rough idle, hesitation
- May appear with P0171 on V6/V8 engines
Typical fixes
- Smoke test for vacuum leaks
- Inspect intake gaskets and hoses
- Check fuel pressure and filter
Repair cost range
For a Porsche, repairs for P0174 often fall between $100 and $600, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Porsche
Porsche 3.6L V6 (VW Group EA837/EA839 derived) P0174 alongside P0171 is typically a MAF sensor failure or a boost leak on turbocharged Macan models. On Cayenne V6, the intake air temperature sensor and large PCV hoses are secondary suspects for cross-bank lean conditions.
Most commonly affected models
Cayenne 3.6L V6 2011–2018Panamera 3.6L V6 2010–2016Macan 3.0T V6 2015–2023