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Old 11-30-2006, 05:04 PM   #1
pornstar1969
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Default Need some help with this check engine code!!

My car is 06 STI here are my mods first:
-Aps 3.5" TBE catless
-Aps Dr725 front mount
-Aps CAI
-Turbo XS UTEC

So here is the problem i first got the system too lean bank 1 and i deleted once thinking maybe it was coincidental. Then it came on for a second time so i put the utec back to stock map and it still throws the code. Though it doesn't seem to as often, possibly because the weather here has been fluctuating. Anyway i was running the base stage 2 map from turbo xs. During the summer it was running extremely rich. How it can be related i dont know but a mechanic here says it could have affected the o2 sensor. Any help wuld be greatly appreciated.
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Old 12-01-2006, 04:41 PM   #2
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Bump for some info.
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Old 12-01-2006, 06:35 PM   #3
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Quote:
Originally Posted by pornstar1969 View Post
My car is 06 STI here are my mods first:
-Aps 3.5" TBE catless
-Aps Dr725 front mount
-Aps CAI
-Turbo XS UTEC
I'd suspect the CAI if your UTEC hasn't been re-tuned. Some intakes whack out the MAF sensor, which can make the engine do unpleasant things. APS claims their 65mm intake won't mess with A/F ratios, but their 70mm will (http://www.airpowersystems.com.au/wrx/my01/hfa.htm) Which one do you have?

Ye olde Unabomber Intake FAQ:
http://forums.nasioc.com/forums/show...hreadid=477393

Quick check would be to pull out the CAI and see if the issue goes away...
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Old 12-02-2006, 08:19 AM   #4
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I have the 65mm and I am 95 percent sure its not the intake, because I had the intake on since I have had the car. So it should have started throwing codes a year ago. A few mechanics that I work with are tellin me it sounds like it is an 02 senser. Since I was running a base map from turbo xs in the summer which caused it to run very rich, he seems to think it could have fouled out the sensor. Personally I have no idea it just seems to me that if it was the intake it would have done it along time ago. Anyway i may go get a 02 and see if that works. Unless anybody else can tell me otherwise.
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Old 12-02-2006, 07:43 PM   #5
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do you have a mechanicle CEL fic on the rear 02 sensor?
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Old 12-02-2006, 08:12 PM   #6
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Take it to Andrewtech Automotive.....they'll do you right.
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Old 12-04-2006, 01:37 PM   #7
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I don't have any cel fix on the o2 right now. I would rather not pay someone else to install parts. Once i figure out what is causing it I will fix it myself.
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Old 12-04-2006, 03:01 PM   #8
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Originally Posted by pornstar1969 View Post
I don't have any cel fix on the o2 right now. I would rather not pay someone else to install parts. Once i figure out what is causing it I will fix it myself.
Bank 1 sensor is the front o2 sensor, not the rear. There is no CEL fix that I am aware of. I had this code for months, but once I got a new EcuTeK map after being retuned it went away after a few hundred miles and hasn't returned thousands later. The front o2 is absolutely necessary, whereas the CEL fix for the rear o2 simply tricks the ECU. I don't believe you can do this to the front sensor. Be prepared to pay $160-200 at your local dealer or $120-150 from Jamie at SGP.
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Old 12-04-2006, 03:39 PM   #9
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Originally Posted by Unabomber View Post
Take it to Andrewtech Automotive.....they'll do you right.
qft, goin there tomorrow myself
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Old 12-04-2006, 07:06 PM   #10
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If you have a P0171, it is caused by the ECU seeing a lean condition on bank one only that is out of the range of the ECU to correct. I would check any vacuum lines or hoses on bank 1 (cyl #1 side), or anything that would cause a lean condition. A CAI or MAF problem would usually cause both banks to show similar problems. Hope that helps, good luck tomorrow at AndrewTech.
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Old 12-04-2006, 07:43 PM   #11
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Quote:
Originally Posted by pornstar1969 View Post
Bump for some info.
Bump for the actual diagnostic trouble code.
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Old 12-04-2006, 08:05 PM   #12
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What version of firmware are you running on the Utec?
The lean code was a glitch in the old firmware, update to the latest firmware and it should go away.

TMS
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Old 12-04-2006, 09:09 PM   #13
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Quote:
Originally Posted by Rampage180 View Post
If you have a P0171, it is caused by the ECU seeing a lean condition on bank one only that is out of the range of the ECU to correct. I would check any vacuum lines or hoses on bank 1 (cyl #1 side), or anything that would cause a lean condition. A CAI or MAF problem would usually cause both banks to show similar problems. Hope that helps, good luck tomorrow at AndrewTech.
it has nothing to do with cyl#1. Understanding what the OBD2 codes tell you is step1. Step2 is taking the correct diagnostic procedure. "Too lean, bank1 sensor1" means the front O2 sensor.

The correct diagnostic procedure is to do an intake pressure test to find where that extra air is getting in past your MAF sensor. If you find no leaks, proceed by cleaning your MAF sensor with an approved cleaning spray (e.g. CRC MAF Sensor Cleaner).

Beyond that, start replacing parts with stock stuff - first of all remove the UTEC and put the stock intake back on (temporarily) one by one to see which part is causing it.
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Old 12-05-2006, 02:11 PM   #14
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I will drive it and see if it will throw the codes again and get the number. It has been the same set-up for almost a year now excluding the front mount which went on in May, and I have never had a problem until now. As far as the firmaware goes I am not sure I know for a fact its not the new firmware that turbo xs just released. I am pretty sure it was the previous. Not sure that any of this rant helps, but I haven't had alot of time lately to play with the car to start narrowing down things.
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Old 12-05-2006, 06:02 PM   #15
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Quote:
Originally Posted by nhluhr View Post
it has nothing to do with cyl#1. Understanding what the OBD2 codes tell you is step1. Step2 is taking the correct diagnostic procedure. "Too lean, bank1 sensor1" means the front O2 sensor.

The correct diagnostic procedure is to do an intake pressure test to find where that extra air is getting in past your MAF sensor. If you find no leaks, proceed by cleaning your MAF sensor with an approved cleaning spray (e.g. CRC MAF Sensor Cleaner).

Beyond that, start replacing parts with stock stuff - first of all remove the UTEC and put the stock intake back on (temporarily) one by one to see which part is causing it.
I never said cyl 1 was causing anything, just referencing the bank the problem was on. There are 2 cylinder banks, if there is a bank 1 lean code, there is probably a sensor failure or vacuum leak on bank 1. Reading comprehension FTW.
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Old 12-05-2006, 06:13 PM   #16
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You still don't get it. Bank1 does not refer to one of the sides of the engine. It refers to the first 'bank' of O2 sensors. On a 4cylinder engine, there are not two banks of O2 sensors.

Don't bring that "reading comprehension" b.s. at me unless you know what the hell you're talking about and it's quite apparent that you're talking out your ass.
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Old 12-05-2006, 07:37 PM   #17
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Quote:
Originally Posted by Rampage180 View Post
I never said cyl 1 was causing anything, just referencing the bank the problem was on. There are 2 cylinder banks, if there is a bank 1 lean code, there is probably a sensor failure or vacuum leak on bank 1. Reading comprehension FTW.
If you had read 2 posts above yours you would've seen that I said:

Quote:
Originally Posted by wrxfactor
Bank 1 sensor is the front o2 sensor, not the rear.
Very simple, like nhluhr said, bank 1 is refering to which sensor it is. On our cars, there is only one up front, so it is bank 1. There is no bank 2. It has nothing to do with which side it is on, at all. Reading comprehension FTW, eh?
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Old 12-07-2006, 05:04 PM   #18
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Well i got another 02 today, so when i get home I will put it on and drive the car tomorrow. I will let you all know if it fixes the problem.

P.S.- This sensor is kinda expensive. $137 my cost.
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Old 12-07-2006, 06:07 PM   #19
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Why did you buy another sensor? What diagnostic steps did you take to determine your old sensor was bad? I don't even know why you posted here if you were just going to buy a new sensor.
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Old 12-07-2006, 09:24 PM   #20
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Quote:
Originally Posted by nhluhr View Post
Why did you buy another sensor? What diagnostic steps did you take to determine your old sensor was bad? I don't even know why you posted here if you were just going to buy a new sensor.
Yeah, that was dumb. I was running hella rich when I threw the code, and once I got retuned, it went away. I drove over 5k miles with richness that brought me from 22-23mpg down to 15mpg, so pretty damn rich. It's amazing this guy went out and dropped the dough on a new sensor when he could probably tune his car with his Utec or pay someone to and the code would go away. It makes me question why he has a Utec and hasn't custom tuned it himself from the basemap.
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Old 12-08-2006, 05:15 PM   #21
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First of all the reason i posted was because i am lean now. The reason I bought a new sensor was because that is what i had two mechanics tell me, which in turn wasted my money.I guess I was just desperate to find the easy answer, and since that was what they told me I listened. I am a bodyman not a tech. We checked for vacuum leaks today but found nothing. Assuming their method was correct we sprayed around all vacuum lines and anywhere there could be one with throttlebody cleaner. I am not sure now what to do next. So any insight would help. I don't want to take it to the dealer because i know they will void my warranty and I really don't have the cash to take it to someone like andrewtech. So I am kinda stuck with what i get from here and what other techs advise me.


Also from the above the code is a PO171
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Old 12-08-2006, 08:49 PM   #22
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Quote:
Originally Posted by pornstar1969 View Post
First of all the reason i posted was because i am lean now. The reason I bought a new sensor was because that is what i had two mechanics tell me, which in turn wasted my money.I guess I was just desperate to find the easy answer, and since that was what they told me I listened. I am a bodyman not a tech. We checked for vacuum leaks today but found nothing. Assuming their method was correct we sprayed around all vacuum lines and anywhere there could be one with throttlebody cleaner. I am not sure now what to do next. So any insight would help. I don't want to take it to the dealer because i know they will void my warranty and I really don't have the cash to take it to someone like andrewtech. So I am kinda stuck with what i get from here and what other techs advise me.


Also from the above the code is a PO171
Step 1. Get rid of the damn intake.
Step 2. Get someone to tune your car or learn to tune it yourself with a laptop.
Step 3. Consult this thread: http://forums.nasioc.com/forums/show...ighlight=p0171 and specifically read #9, I'm pretty sure that could be your issue.
Step 4. Solve the problem and enjoy your car.

Good luck,
Chris

P.S. The code is P0171, with a zero, not an "O"
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Old 12-09-2006, 09:28 AM   #23
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First of all I have had the "damn" intake for over a year and never had it throw this code. Second of all it has nothing to do with the utec because i took the utec out and it still does it. So on to the next thing. And once I do get it runnin right again I will go get it tuned.

Also does this sound legittimate i just found it.http://forums.nasioc.com/forums/show...hreadid=463660 Apparently you cannot clutch ion at speed or it will cause it to throw it also. Let me know if you think this could be another possibility.

This is kinda making me think that is what it is for the simple fact that i put the FMIC on in the summer. Now it is colder which equals more air and leans a car out too. But looking on the data logger from yesterday the ecu was adding 25% fueling on short term. Once you got on the gas it dropped and off it went to 0 until it settled back at idle then it was 25% again.

Last edited by pornstar1969; 12-09-2006 at 09:42 AM.
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Old 12-09-2006, 10:35 AM   #24
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We checked for vacuum leaks today but found nothing. Assuming their method was correct we sprayed around all vacuum lines and anywhere there could be one with throttlebody cleaner.
You might as well use a flashlight.... that is NOT an effective method.

Search for "intake pressure test" on how to do it. Also, for the health of your engine and the solidarity of your bank account, stop listening to those monkeys you call mechanics.
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Old 12-09-2006, 11:33 AM   #25
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Quote:
Originally Posted by pornstar1969 View Post
First of all I have had the "damn" intake for over a year and never had it throw this code. Second of all it has nothing to do with the utec because i took the utec out and it still does it. So on to the next thing. And once I do get it runnin right again I will go get it tuned.

Also does this sound legittimate i just found it.http://forums.nasioc.com/forums/show...hreadid=463660 Apparently you cannot clutch ion at speed or it will cause it to throw it also. Let me know if you think this could be another possibility.

This is kinda making me think that is what it is for the simple fact that i put the FMIC on in the summer. Now it is colder which equals more air and leans a car out too. But looking on the data logger from yesterday the ecu was adding 25% fueling on short term. Once you got on the gas it dropped and off it went to 0 until it settled back at idle then it was 25% again.
I had the red APS intake with the 65mm stamped on the inside and after about 8 months of having it, guess what, I threw a CEL. Something else I expected is that you're running a basemap with mods that are not on there. Either way, your ECU wants to adjust fueling outside of its given parameters. Note that you haven't had a problem until it got cold and the air density changed. Getting it tuned will most likely get rid of the CEL and get your car to run correctly. Running around on basemaps when you have some different mods that are pretty big is not the thing to do.
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