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Po 174 system to lean bank 2 - 2005 Mercury Mountaineer AWD

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Posted on Jan 02, 2017

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SOURCE: 97 Mercury cougar xr7 v6. po443, po430, po171, po174,

Sounds like you have low fuel supply or a leak in intake system causing lean codes, check fuek pressure and volume first. Cat converter effeciancy could be caused by the lean codes, purge system sounds like solenoid failure, check for high resistance accross purge vent solenoid.

Posted on Mar 08, 2010

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kapishtech
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SOURCE: recently had my smog done check engine light w 3

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.
P0174 OBD-II Trouble Code Technical Description

System Too Lean (Bank 2)
What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

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P0430 means you're going to buy a cat. (And you'll have to fix the coolant leak.)Catalyst System Low Efficiency (Bank 2) .Also check O2 sensors .

Thanks.

Posted on Oct 01, 2010

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1 Answer

Where is the PO 174 bank 2 system too lean located on a 2003 Hummer? I'm looking for which side and is it before or after the cat converter. Thanks!


Bank two related to cylinders 2, 4, 6 and 8. Follow the exhaust manifold and after the catalytic converter you will see the O2 sensor which I believe you need to replace.

Nov 28, 2016 | Cars & Trucks

1 Answer

What is PO 174 on a 2005 ford taurus


Bank 2 lean. Bank 2 is the rear cylinder bank. There are several possible causes. From leaky lower intake manifold gasket to failed O2 sensors.

Oct 12, 2016 | 2005 Ford Taurus

1 Answer

Po 171 174 codes


code P0171 is ; system too lean (bank1)
code P0174 is . system too lean (bank 2)

Oct 20, 2013 | Chevrolet Cars & Trucks

1 Answer

System lean bank 1 p0172 fuel


PO 171 Bank 1 too lean
PO 174 Bank 2 too lean
Why ?
The front O2 Sensors need to be replaced at
100,000 miles or sooner, if they have actually failed
They are reading too lean because the system is too
rich & the computer is driving the fuel trim or injector
pulse lean, thus the codes or failed sensors, yes both
Have to check fuel trim with a scan tool
Have to check fuel pressure
Have to check there are no leaking injectors
Have to check for Vacuum Leaks from the intake
all the way to the exhaust converter
Your working a rich condition keeping in mind the system
is driven lean
You look at fuel trim short & long,sort of a past history
of events
May want to look at converter temps also
The converters won't last long if you have or has
a rich condition from fuel or cylinder misfires
Now the spark plugs can't be over 3 years old
& no mifires,get that out of the way before working
the O2 issues

Jul 27, 2013 | 2005 Mitsubishi Endeavor

1 Answer

Fault code 533 and 174


PO 174--System Too Lean (Bank 2) oxygen sensor

PO 533--A/C Refrigerant Pressure Sensor Circuit High Input

Should idle okey without a/c on-- or you got more things to work on

Nov 30, 2012 | Cars & Trucks

1 Answer

PO 171 and PO 174


You did not list a vehicle, so here are the generic codes.
Code 171 is system lean bank one and code 174 is system lean bank two.
The computer is getting a signal from the O2 sensors saying the fuel system is too lean, and the computer can not make it rich.
Possible causes are low fuel pressure, vac leaks, EGR valve problems, and so on.

Jul 27, 2012 | Cars & Trucks

1 Answer

Please tell me what this means,,, po171 band 1 system too lean and po174 band 2 system too lean, thank you, jill


PO 171--is an O2 Sensor Code for a Lean Condition
on Bank 1 (right side exhaust)

PO 174 -- is an O2 Sensor Codes for a Lean Condition
on Bank 2 (left side exhaust)

You gave us no vehicle
You gave us no drivability issues or
vehicle history,nothing

If the O2's have 100,000 miles on them,change the (2)
closest to the engine. They are most likely worn out
& the switching times are too slow to control injector
pulse width & thus set a MIL Lamp (OBD2 Fault ) on
your dash

You can learn a lot on the internet if you put OBD2 in your
Search Engine (Internet Explorer,etc)

Jul 15, 2011 | Lincoln Town Car Cars & Trucks

2 Answers

Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

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

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