P0174 on Ford: System Too Lean (Bank 2)
Severity: 2 of 4
Usually drivable for a short time with a steady light and normal running. Address it soon. Park it if misfire codes appear or the light flashes.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0174 usually means on a Ford
P0174 on Ford V8 trucks and SUVs usually appears together with P0171. Because both banks share the MAF sensor and intake, a single leak or contaminated MAF affects both sides.
If P0174 sets alone, look at bank 2 specifics: an intake gasket section on that side or an exhaust leak ahead of the bank 2 front sensor.
Most likely causes on Ford vehicles
- Dirty MAF sensor
- Vacuum or PCV hose leak
- Intake gasket on bank 2
- Low fuel pressure
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Ford specific tips
- Compare short and long term fuel trims at idle and at 2,500 rpm; a leak improves at higher rpm, a fuel supply problem gets worse.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Vacuum hose | $10 to $80 | 0.3 to 1.0 h | $10 + 0.3 × $110 = $43 $80 + 1.0 × $190 = $270 |
| MAF sensor cleaning or replacement | $10 to $250 | 0.2 to 0.5 h | $10 + 0.2 × $110 = $32 $250 + 0.5 × $190 = $345 |
| Intake manifold gasket | $20 to $150 | 1.5 to 4.5 h | $20 + 1.5 × $110 = $185 $150 + 4.5 × $190 = $1,005 |
Costs are generic for this code; parts and labor on some Ford models may run higher.
Watch a repair video
System Too Lean: Code P0171 or P0174 (1A Auto). Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0174 Ford fix” videos.
Repair manuals
Step-by-step service manuals for Ford with torque specs and wiring diagrams:
Haynes manuals for Ford Chilton manuals
Affiliate disclosure: links in this box may earn FixOrPark a commission at no extra cost to you.
Check Ford recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Is P0174 more serious than P0171?
No. They mean the same thing for different banks.
Read the full P0174 guide or more Ford check engine notes.