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Ford 4.6 code po174 bank 2 too lean

I have a ford mustang 4.6 code po174 bank 2 too lean ,new fuel injectors and maf sensor,any thoughts.

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  • yadayada
    yadayada May 11, 2010

    IS IT REALLY LEAN, WHAT IS THE FUEL TRIM DOING?

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O2 sensor faulty.

Posted on Jul 18, 2009

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I have the codes are po171 ..po174


code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---air system---MAF/VAF sensor--fuel pressure / pump---injector/ s---HO2S
code p 0172 refers to system too rich, bank 1===causes --intake blocked ---EVAP canister purge valve --fuel pressure --EGR system---injector/s -=-- HO2S
code p 0173 refers to fuel trim(FT) bank 2--malfunction===causes --intake leak---air system--fuel pressure /pump---injector/s --EVAP canister purge valve---HO2S
code p 0174 refers to system too lean, bank 2===causes intake / exhaust leak---fuel pressure /pump---injector/s---Air system---hose connection/s
I was not sure if you wanted all codes or just the first and last, however you will see that there are some common problems that may help point you in the right direction
1-- is the heated oxygen sensor (HO2S) which is the sensor before the cat converter
2--is the fuel pressure , so a fuel pressure test will determine if a regulator or fuel pump problem,
3--EVAP canister purge valve --replace as required
4--intake / exhaust leak --check for vacuum hose failure including hoses to vent controls and check the flexible exhaust connection before the cat converter for leaks
The rest are there to check if you haven't fix the fault before you get to them

Nov 05, 2015 | Cars & Trucks

1 Answer

I am getting PO171 and PO174 codes on my 2006 mustang gt with the 4.6L v8.


the codes refer to system too lean on banks one and two===causes --intake /exhaust leak--MAF/VAF sensors fuel pressures/pump---injectors HO2S ( heated oxygen sensors in the exhaust manifolds before the cat converters
the fuel trim is what the computer sets at after a long term run and not after a few trips around the block
it is the HO2S sensors that control the mixture by reading the exhaust gas composition and reporting to the ECM which adjusts the injector operation
they could be getting a bad reading is the flex section of the exhaust manifold pipe is cracked in side of the braid covering

Jul 21, 2017 | 2006 Ford Mustang GT

1 Answer

2000 ford windstar toubleshoot code PO174


CODE PO174 - FUEL SYSTEM TOO LEAN CYLINDER BANK 2. POSSIBLE CAUSES LEAKING EGR GASKET OR LEAKING EGR VALVE DIAPHRAM. MAF SENSOR DIRTY .AIR LEAKS AFTER THE MAF SENSOR OR LEAKS IN THE PCV SYSTEM.EXHAUST LEAK BEFORE OR NEAR THE HO2S IS MOUNTED.WEAK FUEL PUMP,RESTRICTED FUEL INJECTORS.

Aug 06, 2011 | 2000 Ford Windstar

2 Answers

Po174


A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive. This code is not set on four cylinder engines (no bank 2).
WHAT A LEAN CODE MEANS
A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance . Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Dec 24, 2010 | Ford Explorer Cars & Trucks

1 Answer

Ford f150 2001 code p0172 and code p0174


CODE PO172 - SYSTEM ADAPTIVE FUEL TOO RICH BANK 1 POSSIBLE CAUSE EVAP VAPOR RECOVERY SYSTEM FAILURE MAY BE PULLING VACUUM.FUEL PRESSURE REGULATOR FAULTY.HO2S ELEMENT CONTAMINATED.LEAKING FUEL INJECTORS. CODE PO174 - FUEL SYSTEM TOO LEAN CYLINDER BANK 2. POSSIBLE CAUSE EXHAUST LEAKS BEFORE OR NEAR THE HO2S,WEAK FUEL PUMP.RESTRICTED FUEL INJECTORS, LEAKING EGR VALVE GASKET OR DIAPHRAGM.MAF SENSOR DIRTY CAUSING PCM TO UNDERESTIMATE AIRFLOW.

Aug 25, 2010 | 1997 Ford F150 Regular Cab

3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

2 Answers

2002 Chevy Van with a 3400 code po171 too lean how to fix


Code PO171- Lean mix of Bank 1.
Code PO174- Lean mix of Bank 2.

Most of the time a P0171 and P0174 is caused by either a vacuum leak--more than likely the PCV hose and valve or a dirty or defective Mass Airflow (MAF)sensor. Low fuel pressure can also cause this condition. The PCV hose is located on bank one but can affect both sides because the other end is located on the back of the upper intake manifold. Usually they deteriorate and get a hole in it.

Clean the the MAF sensor with MAF cleaner, which you can pick up at any Auto parts store and also pick up a bottle of fuel injector cleaner. Good luck and hope this helps.

Nov 16, 2009 | 2002 Chevrolet Venture Passanger

4 Answers

Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?


those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

Sep 16, 2009 | 1997 Ford F150 Regular Cab

2 Answers

1995 Ford Windstar LX 3.5L Error Codes?


  1. P0171-bank 1 lean, usually oxygen sensor
  2. P0174-bank 2 lean, usually oxygen sensor
  3. PO402-EGR ins. flow, Clean EGR exhaust tubes and replace sensor should fix this problem

Dec 31, 2008 | 1995 Ford Windstar

1 Answer

Obd code P1131 and PO174


P1131 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
P0174 - Fuel Trim System Lean Bank 2

Clean the MAF sensor and check for vacuum leaks at the intake manfold or the injector O rings.

Nov 13, 2008 | Ford Ranger Cars & Trucks

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