Moderate SeveritySafe to drive (short-term)Fuel System
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.
What does P0174 mean?
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.
P0174 is a fuel system-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0174 and illuminates the check engine light.
What are the symptoms of P0174?
If your vehicle has triggered P0174, you may notice one or more of these symptoms:
Check engine light illuminated
Rough or high idle
Hesitation during acceleration
Reduced fuel economy
Engine may stall at idle
Possible hissing sound from vacuum leak
What causes P0174?
Here are the most common causes of P0174, ranked by how likely they are to be the culprit:
Generally yes, for short-term driving. Short-term driving is safe. Avoid heavy load and high RPM. A lean condition increases combustion temperatures and can damage catalytic converters and exhaust valves if left unaddressed. Fix within a couple of weeks.
How do you diagnose P0174?
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?
Repair costs for P0174 vary depending on the root cause and your vehicle. Here are typical estimates:
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Fix vacuum leak (replace hose or gasket)
€5–€60
€60–€200
€65–€260
Moderate
Clean or replace MAF sensor
€10–€200
€20–€60
€30–€260
Easy
Replace fuel pump
€100–€400
€100–€300
€200–€700
Professional
Clean fuel injectors
€15–€50
€50–€150
€65–€200
Moderate
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0174 on specific vehicles
P0174 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:
P0174 on Toyota Camry
Toyota Camry • 2007-2024
P0174 on the Camry only appears on the V6 (2GR-FE) since the 4-cylinder is single-bank. On the V6, Bank 2 intake manifold gaskets can develop vacuum leaks, especially on 2007-2011 models. The Bank 2 injectors are on the firewall side, making access harder.
What causes P0174 on a Toyota Camry?
Toyota CamryBank 2 intake manifold gasket vacuum leak on 2GR-FE V6
Toyota CamryBank 2 injectors harder to access (firewall side) delays diagnosis
P0174 on Honda Civic
Honda Civic • 2006-2024
Most 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 Civic?
Honda CivicExtremely rare on Civics since most are inline-4 (single bank)
Honda CivicPossible scan tool misread on inline-4 models
P0174 repair cost for Honda Civic
Estimated costs for Honda Civic ownersadjusted lower than average due to Honda-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Fix vacuum leak (replace hose or gasket)
€5–€54
€54–€180
€59–€234
Moderate
Clean or replace MAF sensor
€9–€180
€18–€54
€27–€234
Easy
Replace fuel pump
€90–€360
€90–€270
€180–€630
Professional
Clean fuel injectors
€14–€45
€45–€135
€59–€180
Moderate
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0174 on Volkswagen Golf
Volkswagen Golf • 2005-2024
Standard Golf models are inline-4 and won't produce P0174. The VR6-powered Golf R32 can trigger it. On VR6 models, the Bank 2 side vacuum lines and PCV connections are the most common leak sources.
What causes P0174 on a Volkswagen Golf?
Volkswagen GolfBank 2 vacuum line and PCV connection leaks on VR6 (R32)
Volkswagen GolfNot applicable to standard TSI/TFSI inline-4 Golf models
P0174 repair cost for Volkswagen Golf
Estimated costs for Volkswagen Golf ownersadjusted higher than average due to Volkswagen-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Fix vacuum leak (replace hose or gasket)
€6–€69
€69–€230
€75–€299
Moderate
Clean or replace MAF sensor
€12–€230
€23–€69
€35–€299
Easy
Replace fuel pump
€115–€460
€115–€345
€230–€805
Professional
Clean fuel injectors
€17–€57
€57–€173
€75–€230
Moderate
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0174 on BMW 3 Series
BMW 3 Series • 2006-2024
BMW inline-6 engines (N52, N55, B58) are single-bank and won't produce P0174. The V8 S65 (E90 M3) and older V8 models will. On the S65, Bank 2 throttle body vacuum leaks and VANOS issues are the primary P0174 triggers.
What causes P0174 on a BMW 3 Series?
BMW 3 SeriesBank 2 throttle body vacuum leak on S65 V8 (E90 M3)
BMW 3 SeriesVANOS issues causing lean condition on V8 models
P0174 repair cost for BMW 3 Series
Estimated costs for BMW 3 Series ownersadjusted higher than average due to BMW-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Fix vacuum leak (replace hose or gasket)
€7–€84
€84–€280
€91–€364
Moderate
Clean or replace MAF sensor
€14–€280
€28–€84
€42–€364
Easy
Replace fuel pump
€140–€560
€140–€420
€280–€980
Professional
Clean fuel injectors
€21–€70
€70–€210
€91–€280
Moderate
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related diagnostic codes
These codes are often seen alongside P0174 or indicate related issues:
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.
