P0174 OBD-II Trouble Code: System Too Lean (Bank 2)

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0174 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0174 code

P0174 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0174 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0174 code definition

System Too Lean (Bank 2)

What the P0174 code means

Code P0174 indicates that there is a lean condition detected by the Engine Control Module (ECM). A lean condition will be created if there is too much air, and not enough fuel, in the air fuel ratio (AFR). The ECM is designed with the capability of adjusting a lean condition back to normal, but only in small to mediocre amounts. If the air fuel ratio requires more compensation to return to normal than the ECU is capable of, code P0174 may set.

What causes the P0174 code?

  • An air leak after the mass air flow (MAF) sensor, such as a torn intake boot, or bad intake manifold gaskets
  • A dirty or faulty mass air flow sensor
  • Faulty oxygen sensor
  • Incorrect fuel pressure
  • Leaking positive crankcase ventilation (PCV) valve
  • Clogged exhaust gas recirculation (EGR) Port
  • Leaking brake booster

What are the symptoms of the P0174 code?

  • Increased fuel consumption
  • Check Engine Light will come on
  • Rough or high idle
  • Decreased acceleration
  • Engine stalling

How does a mechanic diagnose the P0174 code?

  • Performs a fuel pressure test
  • Checks the intake system and vacuum lines for leaks
  • Inspects the valve cover for worn hoses or leaks
  • Inspects the PCV valve
  • Tests the mass air flow sensor with a scan tool or multimeter
  • Tests the related oxygen sensor with a scan tool or multimeter

Common mistakes when diagnosing the P0174 code?

  • Replacing a component without first deeming it bad through testing
  • Failing to check the intake system for tears or leaks

How serious is the P0174 code?

Generally, a lean condition is not that serious. However, be aware that there is a possibility of the lean condition being caused by a leak in the intake system. Leaks in the air intake may allow particles to enter the engine, which may be damaging.

What repairs can fix the P0174 code?

Additional comments for consideration regarding the P0174 code

Be sure to check the intake manifold and vacuum lines for leaks.

Need help with a P0174 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0174

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0174 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,636

Rating Summary
3,315
161
42
24
94
3,315
161
42
24
94

Nathan

26 years of experience
235 reviews
Nathan
26 years of experience
Still the best mechanic around!
2010 DODGE AVENGER - CHECK ENGINE LIGHT IS ON - BROKEN ARROW, OKLAHOMA

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
I really appreciate Pete's mechanical knowledge and willingness to work with customers to get the job done right.
2007 DODGE RAM 1500 - CHECK ENGINE LIGHT IS ON - SUN CITY, ARIZONA

Tien

20 years of experience
746 reviews
Tien
20 years of experience
Second time I have had my car serviced / evaluated by Tien... same good service both times.
2007 MERCEDES-BENZ CLK350 - CHECK ENGINE LIGHT IS ON - ORINDA, CALIFORNIA

Fernando

10 years of experience
31 reviews
Fernando
10 years of experience
So friendly and helpful. Took the time to walk me through what he was doing. Definitely appreciated that. Let me know what was wrong and how to fix it so I can continue to drive my lil baby lol. Thanks again Fernando!
1997 TOYOTA TERCEL - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...

Related questions

Q: p0303, p1313, p0420. codes come up. no flashing and now signs. what do I do?

Hi there. Sounds like there are a few things going on. First the code P1313 means that the timing chain has jumped a tooth making the camshaft and crankshaft out of sync. The chain tensioner may need replaced if it...

Q: I have a 2006 Suzuki Forenza and recently just got the engine replaced. after driving it for a while yesterday the malfunction ind

Without knowing what caused the check engine light to come on or the codes stored it would not be able to be determined if engine damage can occur if you continue to drive it. I would recommend having the codes...

Q: Unable to go past 70-80 Km when going up a hill. Code P0174 with flashing engine light

Hello. A flashing Check Engine Light is an indicator that the computer has detected an issue that may potentially cause harm to the vehicle's emission system components. The code P0174 indicates a lean condition on bank 2 of the engine....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com