All codes › P0174
P0174: System Too Lean (Bank 2)
What it means
Bank 2 is running lean. If P0171 is also set, look for something shared like a vacuum leak or MAF.
Severity: Medium Bank 2 lean; if paired with P0171 suspect a shared vacuum leak.
Common causes
- Vacuum leak
- Dirty MAF
- Low fuel pressure
- Bank 2 intake gasket leak
Most common causes first. Exact causes vary by make, model and engine.
Can I fix it myself?
Sometimes DIY. Smoke test the intake; inspect PCV hoses.
Repair cost
SEEDED ESTIMATE Roughly $50–$260
Most likely repair: cleaning / no part. Diagnosis fees, taxes and other causes are not included.
| Line | Low | High | Basis |
|---|---|---|---|
| Cleaning / no part | $0 | $20 | Editorial placeholder, parts price not yet cited |
| Labor 0.5–1.5 hr | $50 | $240 | $100–$160/hr, shop survey |
⚠️ This is an editorial placeholder range for this type of repair. It is not based on real invoices or licensed pricing data yet. Real ranges will appear here once enough reader invoices for P0174 are verified.
Verified reader invoices for P0174: 0. Share your repair bill to help build real costs.
Tools that can read P0174
- ScanFixAI: Pro $29.99/mo or $249.99/yr
- OBDAI: Annual PRO bundle $299
- BlueDriver Pro Next-Gen: $119.95 list ($99.95 sale seen)
The Check Engine Weekly
One email a week: new AI diagnostic tools, real repair costs from reader invoices, and one code explained.
Newsletter launching soon.