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

3,203

Rating Summary
2,919
140
39
22
83
2,919
140
39
22
83

Nathan

26 years of experience
198 reviews
Nathan
26 years of experience
Nathan was knowledgeable about my car and very educational as well. He explained everything he was doing and why. I admire his attention to detail. He really showed genuine interest and attentiveness to the problem. He’s a great conversationalist and was easy to work with.
2013 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - GLENPOOL, OKLAHOMA

Mack

19 years of experience
72 reviews
Mack
19 years of experience
Very nice and knew what he was doing. Got what I needed done even though was told wrong by the office.
1999 FORD F-150 - CHECK ENGINE LIGHT IS ON - MIDLOTHIAN, TEXAS

Scott

31 years of experience
24 reviews
Scott
31 years of experience
Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
2001 HYUNDAI ELANTRA - CHECK ENGINE LIGHT IS ON - PARKVILLE, MARYLAND

Tyrone

6 years of experience
61 reviews
Tyrone
6 years of experience
He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
2008 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - CULVER CITY, CALIFORNIA

More related articles

Symptoms of a Bad or Failing Flexible Clutch Hose
Common signs include difficulty shifting, low clutch fluid, and feeling no resistance at the clutch pedal.
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...

Related questions

Q: Trouble code P0455

You should have a mechanic use a smoke machine to test the system for leaks. The purge valve may be leaking causing it to not hold any vapor in the tank at idle. If this occurs it will cause the...

Q: the car has suffocation feeling when accelerator is pressed and does not speed constantly

This sounds like a low fuel pressure problem, or an air filter and mass airflow (MAF) sensor problem. Check the fuel pressure and replace the fuel filter first to see if it helps. Next, have the system computer scanned...

Q: codes p0174, p0302, and p2A03 read on code reader.

Hi there. What is happening is the codes are reading for a misfire on cylinder number 2 and the system is too lean on bank 2. Check the spark plugs and the fuel injector on cylinder 2 to see if...

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