What does code P0174 mean on a Infiniti and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Infiniti, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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 Infiniti
- 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 Infiniti, 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 Infiniti
Infiniti VQ35/VQ37 P0174 alongside P0171 indicates a cross-bank lean condition—most likely a vacuum leak affecting both intake banks simultaneously or a faulty MAF sensor. If P0174 appears alone, a bank 2-specific vacuum leak at the upper intake manifold gasket is the most common single-bank cause.
Most commonly affected models