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P0174 Bank 2 system too lean P0305 cylinder 5 miss

P0174 Bank 2 system too lean P0305 cylinder 5 miss fire

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: mazda 6 2003 code p0174 system to lean in bank 2

It means that your MAF Sensor is dirty or faulty, or you may have a vacuum leak downstream of the MAF Sensor in one of the hoses.

In most cases, just cleaning the sensor will fix it. Otherwise you'll have to have all your hoses inspected and or replaced and also a Dirty Fuel filter can cause this code

Posted on Sep 11, 2009

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SOURCE: 2003 Mazda MPV ES that idles very rough when warm

that means could be vacuum leak

Posted on Jan 10, 2010

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SOURCE: On the handheld computer diagnostic too, it

Check or replace your gas cap. When a gas cap gets old it can no longer hold pressure in the tank causing gas fumes to leak out and ambient air to get into causing the check enging light reading. Try replacing it first. It'll only cost you $15.00. Reset your computer with your hand held device. It takes 50 miles for the computer to reset itself. If the problem does not come back after 50 miles then you've got it done cheaply. Good luck.

Posted on Sep 19, 2010

c1apton15
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SOURCE: my 2002 mpv has

More than likely a dirty MAF sensor (Mass Air Flow) It's the large round air intake with wires going to it. It requires special MAF sensor cleaner - DO NOT use spray carb cleaners as you will damage it.

Posted on Mar 25, 2011

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My check engine light is on and the codes po305 and po174 what exactly should I do?


Definition of Diagnostic Trouble Code P0305 Category: Powertrain Definition: Cylinder 5 Misfire DetectedNote: This definition of P0305 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0174 Category: Powertrain Definition: System Too Lean Bank 2Note: This definition of P0174 is applied to all manufacturers

Jul 05, 2015 | 2007 Ford Freestar Limited Minivan

1 Answer

I would like to know what these codes mean


P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0301 Cylinder #1 Misfire Detected
P0302 Cylinder #2 Misfire Detected
P0304 Cylinder #4 Misfire Detected
P0306 Cylinder #6 Misfire Detected

Mar 12, 2014 | 1999 Ford Explorer

1 Answer

System to lean bank, manufacturer control fuel air metering, cylinder misfire detected


Intake or vacum leak will be the first codes 174,171, try idle and spray propane around intake if car idles up, then intake is leaking, otherwise could be a broken vacum line, check with a gauge

Jan 18, 2014 | 2004 Hyundai Tiburon GT V6

2 Answers

What do I need done if codes p0171 p0174 p0301 p0305 p0316 is it major problems


OK, We'll cover the Diagnostic Test Codes (DTCs), starting with the standard definition set by SAE J2012 (Revised December 2007)
DTC P0171 "System Too Lean Bank 1"
DTC P0174 "System Too Lean Bank 2"
DTC P0301 "Cylinder 1 Misfire Detected"
DTC P0305 "Cylinder 5 Misfire Detected"
DTC P0316 "Engine Misfire Detected on Startup (First 1000 Revolutions)"

The "system lean" codes are pretty much telling you that there is way too much oxygen in the exhaust. There is too much oxygen on BOTH sides of the engine, and that is why you are getting codes for bank 1 and for bank 2. Bank 1 is the side where #1 cykinder is located and Bank 2 is the opposite side.

The misfire codes are pretty self-explanatory. #1 and # 5 cylinders are misfiring. The P0316 DTC is telling you that the misfire monitor is detecting a misfire as soon as the engine starts. This tells you that it is a very severe misfire and that the engine does not have to warm up and the car does not have to be driven to detect the misfire.

A misfire can be caused by many things it can be vacuum leaks, bad spark plugs, bad ignition cables, faulty ignition coils, fouled or malfunctioning injectors or injector circuits, blown head gasket, cracked cylinder head, burnt valves, etc.. etc..

However, look at the codes you have. Then look at the firing order for your engine. 2002 Mercury Sable is only equipped with a 3.0L 2V 6-cylinder engine.
The firing order is 1-4-2-5-3-6

Now if you take the firing order and split it in half, stack the two halves on top of each other, it looks like this:
1-4-2
5-3-6

When you look at the firing order this way, you can see that cylinders 1 an 5, 4 and 3, and 2 and 6, are "PAIRED" cylinders. They are exacly opposite in the firing order. Now, the cylinder only fires every second revolution of the crankshaft. With paired cylinders, one of the cylinders in the pair will fire on the first revolution and the other cylinder will fire on the second revolution.

Looking back at your codes, please note that the cylinders that are setting the misfire codes are paired cylinders.

Now the coil pack for your ignition is actually made up of three coils. Each coil fires a set of paired cylinders. If you look at the top of the coil, it will usually be marked with the cylinder numbers that each coil tower is supposed to connect to. The coil will look just like the firing order split and stacked as above.

With all of this said, I would say that it is VERY LIKELY that your misfire codes are being caused by a defective ignition coil.

The lean codes are a little different.

These are USUALLY caused by vacuum leaks which allow too much air into the engine that is not getting measured by the Mass Airflow (MAF) sensor and causes the engine to be getting too much air and not enough fuel (running lean).

I would take a good look at all of the vacuum hoses and lines. Ford is notorious for getting holes in the rubber parts that connect the PCV tubes.

If you do not find any obvious reasons for a vacuum leak, then you may want to fix the misfire codes, reset the computer memory, and drive the vehicle to see if the lean codes come back again. The misfires COULD be the cause of the lean codes. In a perfect world, this is not supposed to happen because the misfire monitors setting codes will not allow the oxygen sensor monitors to run and set lean codes. However, I HAVE seen cylinder misfires that have caused lean codes.

I hope this helps you to figure it out. Good luck!

Feb 03, 2012 | 2002 Mercury Sable

1 Answer

I have got a P0171 & P0174 engine codes on my 2001 mercury sable. What do I do to fix it.


P0171 System Too Lean Bank 1
P0172 System Too Rich Bank 1
P0173 Fuel Trim Bank 2
P0174 System Too Lean Bank 2

OK, that's a partial list of codes, the fuel delivery is controlled by the oxygen sensors, so it's possible that something in that area could be causing your problem.

However, it could also be clogged fuel injectors that can't deliver enough fuel to the cylinders compared to the air that is pulled into the engine.

Try some fuel injector cleaner for that poured into the gas tank.

How does it run?
Does it miss at all?

Oct 08, 2010 | 2001 Mercury Sable

1 Answer

02fordf150 no power p1151 p0174p0305 codes present


p1151 indicates fuel system lean bank 2, p0174 system lean bank 2, p0305 is missfire cylinder number 5. You say no power I take that to mean that is has low power while running, if so with these codes present check your fuel pressure and pressure regulator and fuel pump, it sounds like your fuel system has low pressure and is not responding correctly. Hope this helps, let me know.

Jul 01, 2010 | 2002 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

98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
P0170 Fuel Trim Malfunction (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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May 29, 2009 | 1998 Toyota Camry

1 Answer

Ford f-150 running rough


Ok P0174 Is bank 2 (drivers side) is running lean
P0350 is an ignition coil primary circuit malfunction
P1127 indicates the HO2S heater(s) were not on during KOER Self-Test and testing of the HO2S did not occur.Engine not operating long enough prior to performing KOER Self-Test.
P1780 means that the OD switch on gear shifter was not cycled off then on during self test.
I would recommend re-running your self test and make sure to warm the engine up first and make sure to cycle the od switch on/off during the test and recheck the codes.
P0174 lean code could be caused by a miss-fire and P0350 could be caused by anything in the ignition(coil,plug,wires,etc.).
If the P0174 and P0350 repeat I would concentrate on the cylinders in bank 2. If you have a spark tester you could hook it to each of those plug wires individually and look for a weak spark. or try and unhook each wire one at a time and see if you can find a weak cylinder that way by the amount of rpm drop and replace the components on that cylinder and retest.

Mar 25, 2009 | 1997 Ford F150 Regular Cab

1 Answer

2000 ford winstar sel update to problem


i had asimiliar misfire on my 2000 windstar.the first thing to check is a broken valve spring by taking off the valve cover the other is a o2 sensor bank 2 i believe is the downstream.if not the valve spring then either the coil pack or thecontrol module. either way it is fairly inexspensive

Mar 02, 2009 | 2000 Ford Windstar

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