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  #1  
Old 12-23-2009, 04:04 AM
velozp velozp is offline
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Default check engine light on 2.5

hello my check engine light came on. Ran to autozone and ran it on their diag machine. Came up saying computer hAS RECOGNIZED A RICH OR LEAN CONDITION ONE ONE ENGINE BANK ONLY. if bank one and 2 codes set together suspect fuel pressure or may be MAF mass air flow ) oxygen sensor defective. I do notice an exhaust leak may be coming from up front somewhere maybe a donut gasket. What are your thoughts on this? THANKS
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  #2  
Old 12-23-2009, 05:22 AM
Jp7 Jp7 is offline
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I think you should fix it before you ruin your catalyst(s)
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  #3  
Old 12-24-2009, 12:28 PM
modelageek modelageek is offline
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Quote:
Originally Posted by velozp View Post
hello my check engine light came on. Ran to autozone and ran it on their diag machine. Came up saying computer hAS RECOGNIZED A RICH OR LEAN CONDITION ONE ONE ENGINE BANK ONLY. if bank one and 2 codes set together suspect fuel pressure or may be MAF mass air flow ) oxygen sensor defective. I do notice an exhaust leak may be coming from up front somewhere maybe a donut gasket. What are your thoughts on this? THANKS
Hi Paul......what was the actual code # or #'s........you need a nice profile like me so we know what we are diagnosing.......
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #4  
Old 12-25-2009, 04:30 AM
velozp velozp is offline
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the autozone one didnt give me a code, all it says is P0171 which I think is the diag computer model and another set of letters is AA1 AA2 . I will go see my buddy who may break it down even more. thanks guys
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  #5  
Old 12-25-2009, 05:18 AM
modelageek modelageek is offline
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the p0171 is the code. .it is a common code...... the code means . system to lean Bank1 bank, if you have a 4 cylinder then that is bank one if you have a V engine it is the first bank, or half the engine. it means you either dont have enough fuel or to much air for that bank. it would help a lot of you made a profile like i have showing as much info about our truck as possible... what year, engine, miles, any maintance,location etc, common cause of p0171 are fuel pressure issue or or a vacuum leak after the maf..........do you have any symptoms other than the code.
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #6  
Old 12-25-2009, 07:32 AM
scheider1980 scheider1980 is offline
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it manybe a oxygen sensor bank 1
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  #7  
Old 12-25-2009, 08:00 AM
Jp7 Jp7 is offline
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Quote:
Originally Posted by modelageek View Post
if you have a 4 cylinder then that is bank one if you have a V engine it is the first bank, or half the engine
The 2.5 (I believe is a 4 cylinder), so bank one would be the only bank - so the entire engine.

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Originally Posted by modelageek View Post
it means you either dont have enough fuel or to much air for that bank.
Not exactly. It means that for some reason after combustion is complete the measured air to fuel ratio is leaner than expected using the fuel map, and the system is richening the mixture up to compensate and achieve stoich.

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Originally Posted by modelageek View Post
common cause of p0171 are fuel pressure issue or or a vacuum leak after the maf.....
Vacuum leaks are after the throttle body, not maf. Unmetered air can enter between the maf and throttle body causing this though (I think thats what you mean)

To the OP: you need to check your fuel trims with a live scanner and see if the mixture is increasing under load, or non-loaded portions or the fuelmap. If it is under load - then you might have a maf related problem. If it is not under load then likely it is a vacuum leak. This is a really easy way to see where the system is adding fuel.
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Looking for a professional retrofitter to add HIDs or LEDs to your Ranger? PM me if your looking to have work done, and have cash to spend.

Quote:
Originally Posted by FireRanger View Post
I'm dying to see this at night. Someone go tell the sun to give up already.
Quote:
Originally Posted by beef08 View Post
Your the man, you bring our dreams to a reality within the lighting spectrum
Quote:
Originally Posted by BCobe View Post
Jp7 you always do AMAZING work! Hats off to you sir
Quote:
Originally Posted by FireRanger View Post
People so often confuse "hating" with "knowing better".
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  #8  
Old 12-25-2009, 08:12 AM
Jp7 Jp7 is offline
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Here is a how-2 for troublshooting:
http://www.fordrangerforum.com/elect...171-p0174.html
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Looking for a professional retrofitter to add HIDs or LEDs to your Ranger? PM me if your looking to have work done, and have cash to spend.

Quote:
Originally Posted by FireRanger View Post
I'm dying to see this at night. Someone go tell the sun to give up already.
Quote:
Originally Posted by beef08 View Post
Your the man, you bring our dreams to a reality within the lighting spectrum
Quote:
Originally Posted by BCobe View Post
Jp7 you always do AMAZING work! Hats off to you sir
Quote:
Originally Posted by FireRanger View Post
People so often confuse "hating" with "knowing better".
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  #9  
Old 12-25-2009, 10:29 AM
modelageek modelageek is offline
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Quote:
Originally Posted by Jp7 View Post
The 2.5 (I believe is a 4 cylinder), so bank one would be the only bank - so the entire engine.



Not exactly. It means that for some reason after combustion is complete the measured air to fuel ratio is leaner than expected using the fuel map, and the system is richening the mixture up to compensate and achieve stoich.



Vacuum leaks are after the throttle body, not maf. Unmetered air can enter between the maf and throttle body causing this though (I think thats what you mean)

To the OP: you need to check your fuel trims with a live scanner and see if the mixture is increasing under load, or non-loaded portions or the fuelmap. If it is under load - then you might have a maf related problem. If it is not under load then likely it is a vacuum leak. This is a really easy way to see where the system is adding fuel.
I try to keep my analyze simple. most people here don't have access to the expensive equipment. it is very easy to tell someone to go get there car analyzed professionally. . imho I think it is best to speak english to them rather then total technical talk that most of the posters don't know what it means. imho. . however it is a free country and go post away as you feel

to the original poster it has been my experience that most of these codes are caused by a vacuum leak or a fuel pressure issue...... if you have access to a $40 fuel pressure gauge you can do a fp test. the other common cause is a vacuum leak, yo can check for these with a can of carb cleaner while the engine is running..........if you have access to a professional shop bring your truck there and they can fix it if you dont you can try some of out ideas.......

*to the op could you please create a good profile for your vehicle and tell us what maintenance has been done.... it is always a good idea to run some good fuel injector cleaner techron is excellant
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Last edited by modelageek; 12-25-2009 at 10:33 AM. Reason: *
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  #10  
Old 12-25-2009, 10:35 AM
Jp7 Jp7 is offline
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Quote:
Originally Posted by modelageek View Post
I try to keep my analyze simple. most people here don't have access to the expensive equipment. it is very easy to tell someone to go get there car analyzed professionally. . imho I think it is best to speak english to them rather then total technical talk that most of the posters don't know what it means. imho. . however it is a free country and go post away as you feel
You can get a scanner at autozone or pepboys. They arent expensive. - I wasn't suggesting he get it analyzed professionally.
__________________
Looking for a professional retrofitter to add HIDs or LEDs to your Ranger? PM me if your looking to have work done, and have cash to spend.

Quote:
Originally Posted by FireRanger View Post
I'm dying to see this at night. Someone go tell the sun to give up already.
Quote:
Originally Posted by beef08 View Post
Your the man, you bring our dreams to a reality within the lighting spectrum
Quote:
Originally Posted by BCobe View Post
Jp7 you always do AMAZING work! Hats off to you sir
Quote:
Originally Posted by FireRanger View Post
People so often confuse "hating" with "knowing better".
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  #11  
Old 12-25-2009, 10:41 AM
modelageek modelageek is offline
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To the OP: you need to check your fuel trims with a live scanner and see if the mixture is increasing under load, or non-loaded portions or the fuelmap. If it is under load - then you might have a maf related problem. If it is not under load then likely it is a vacuum leak. This is a really easy way to see where the system is adding fuel.[/QUOTE]

the op i believe went to AZ. you would have been better off telling him to go back there and ask for the specific info instead of what you posted....imho..............but like i said it is a free country post away.........
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #12  
Old 12-25-2009, 10:45 AM
modelageek modelageek is offline
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Quote:
Originally Posted by Jp7 View Post
I think you should fix it before you ruin your catalyst(s)
I dont agree with this post either....in a perfect world maybe you stop driving most people don't have that option. I think you just unnecessarily worried the op by telling him to not drive because of a p0171....... imho.........post away...jr7 go ahead and help him.....I was not going to until he updated his profile with detailed info of his vehicle.....
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #13  
Old 12-25-2009, 10:47 AM
modelageek modelageek is offline
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Quote:
Originally Posted by scheider1980 View Post
it manybe a oxygen sensor bank 1
imho.....the o2 sensor is probably fine and just reporting the info it is encountering to the puter....
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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