P0174 is the Bank 2 equivalent of P0171. The engine's air-fuel mixture on Bank 2 has too much air or not enough fuel. The ECU detected that it cannot add enough fuel to maintain the correct 14.7:1 ratio, exceeding its positive fuel trim correction range.
DTC/P0174·Honda
P0174 on Honda: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Honda
P0174 on a Honda is the Bank 2 equivalent of P0171. The engine's air-fuel mixture on Bank 2 has too much air or not enough fuel. The ECU detected that it cannot add enough fuel to maintain the correct 14.7:1 ratio, exceeding its positive fuel trim correction range.
Repair cost on Honda€27 - €630
What does P0174 mean on a Honda?
Honda Civic
2006-2024Most Honda Civics are inline-4 and won't trigger P0174 (single bank). Only the rare V6 Civic (older generations) would show this code. If you see P0174 on an inline-4 Civic, verify with a second scanner as it may be a misread.
What causes P0174 on a Honda?
Beyond the generic causes listed on the main P0174 page, these are the Honda-specific patterns we see most often:
Honda CivicExtremely rare on Civics since most are inline-4 (single bank)
Honda CivicPossible scan tool misread on inline-4 models
How to diagnose P0174 on a Honda with OBD2
Follow these steps to pinpoint the root cause of P0174:
- Check if P0171 is also present. Both codes together means a whole-engine cause (MAF, fuel pressure, large vacuum leak), not a Bank 2-specific issue
- Check short-term and long-term fuel trims on Bank 2 with a scan tool. LTFT above +15% confirms lean on that bank
- Perform a smoke test or spray method around Bank 2 intake manifold gaskets and vacuum hoses
- Inspect and clean the MAF sensor with dedicated MAF cleaner
- Check fuel pressure at the rail with a gauge against manufacturer specification
- Check for exhaust leaks before the Bank 2 upstream O2 sensor
How much does P0174 cost to fix on a Honda? (EUR)
Estimated repair costs on a Honda (Honda parts and labour typically run 10% below the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0174 on Honda
These codes commonly cluster with P0174 on Honda vehicles:
FAQ: P0174 on Honda
What is the difference between P0171 and P0174?
Same problem, different engine banks. P0171 is Bank 1 (cylinder 1 side). P0174 is Bank 2. Four-cylinder engines only trigger P0171. P0174 appears on V6, V8, and boxer engines.
What does it mean if I have both P0171 and P0174?
Both banks lean simultaneously almost always points to a shared cause: dirty MAF sensor, low fuel pressure, failing fuel pump, or large vacuum leak on the intake manifold.
Can I drive with P0174?
Yes, for short distances. Avoid heavy load and high RPM. Lean conditions increase combustion temperatures, which can damage catalytic converters and exhaust valves. Fix within a couple of weeks.
How much does it cost to fix P0174?
From nearly free (cleaning MAF, replacing air filter, tightening a vacuum hose) to 300-500 euros for fuel pump or pressure regulator. Most common fixes are under 100 euros.
Looking for the full P0174 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0174 guideSkanyx · Honda
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