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Old 09-14-2018, 07:28 PM   #1
bigboostwagon
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Subaru Stars 2018 wrx stage 1 throwing p0172 code

so i have a 2018 wrx with a stage 1 with a aem cold air,pro tune on a cobb access port. Im throwing the p0172 code. there is no leaks from any hoses or the intake. Any ideas what else it could be at all?
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Old 09-14-2018, 07:50 PM   #2
Elbert Bass
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That's a rich code - wouldn't be caused by a vacuum leak. Could be your canister purge solenoid is stuck open, could be MAF, could be A/F sensor, could be leaking injector, could be high pressure fuel pump, could be coolant temp sensor, could be PCV, could be tune....
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Old 09-14-2018, 09:53 PM   #3
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most likely the tune and/or the intake, but the tuner will tell you to throw a pile of parts that rarely ever fail at it instead of doing the right thing and telling you to put the stock intake back on and get it retuned.
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Old 09-14-2018, 10:24 PM   #4
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Quote:
Originally Posted by n2oiroc View Post
most likely the tune and/or the intake, but the tuner will tell you to throw a pile of parts that rarely ever fail at it instead of doing the right thing and telling you to put the stock intake back on and get it retuned.
You should really stop projecting your own feelings onto others and assuming everyone is unscrupulous. You don't even know who tuned the car, whether or not the tuner is aware of this issue, whether or not it's even his fault, etc...
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Old 09-14-2018, 10:34 PM   #5
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Quote:
Originally Posted by GlarryHoodDIT View Post
You should really stop projecting your own feelings onto others and assuming everyone is unscrupulous. You don't even know who tuned the car, whether or not the tuner is aware of this issue, whether or not it's even his fault, etc...
Projecting? Im going off well over a decade of tuned subaru experience. Sensors dont randomly fail during or right after a tune. Garbage intakes and oiled filters are behind probably 25% of the “my car is acting weird” posts. Any time you want to have a wrench off im down. But what do i know, i only wrench for a living. I dont trust tuners because they get rich off the ignorant.

Why dont you help the guy instead of crying about my posts and show how knowledgeable you are?

Last edited by n2oiroc; 09-14-2018 at 10:53 PM.
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Old 09-14-2018, 11:06 PM   #6
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Another way to rule out bad parts/sensors, put the stock intake back on, clean the maf and unmarry the ap. If the problem is still there let the dealer diagnose and fix it.
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Old 09-15-2018, 01:12 AM   #7
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Quote:
Originally Posted by n2oiroc View Post
Projecting? Im going off well over a decade of tuned subaru experience. Sensors dont randomly fail during or right after a tune. Garbage intakes and oiled filters are behind probably 25% of the “my car is acting weird” posts. Any time you want to have a wrench off im down. But what do i know, i only wrench for a living. I dont trust tuners because they get rich off the ignorant.

Why dont you help the guy instead of crying about my posts and show how knowledgeable you are?
Dude, what? You bash the **** out a tuner, who you don't even know who they are, and offer zero constructive help until after you get called out for it.

There's no reason to assume all tuners are unscrupulous and are only trying to **** the customer. Maybe you just get so used to ****ing people over in your shop you assume everybody does it, I don't know.

Last edited by GlarryHoodDIT; 09-15-2018 at 01:21 AM.
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Old 09-15-2018, 06:22 AM   #8
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Quote:
Originally Posted by GlarryHoodDIT View Post
Dude, what? You bash the **** out a tuner, who you don't even know who they are, and offer zero constructive help until after you get called out for it.

There's no reason to assume all tuners are unscrupulous and are only trying to **** the customer. Maybe you just get so used to ****ing people over in your shop you assume everybody does it, I don't know.
my god, get over it already. Are you going to offer the guy better advice than me or just follow me around crying?
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Old 09-15-2018, 09:17 AM   #9
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Sounds like Glarry is the one who tuned the car lol
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Old 09-15-2018, 09:41 AM   #10
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my god, get over it already. Are you going to offer the guy better advice than me or just follow me around crying?
Lol, not sure why you're getting emotional about it. I'm letting OP know morons like your come on here and bash tuners for absolutely no reason with no basis, far better info than you have given.

Lol and what advice have you given besides, "I dont know what the issue is so take it back to stock and if that doesn't work take it to the dealer to fix it. It happens maybe 1/4 of a time, I think, so its definitely happening to you." Mind blowing advice, you said it's a problem with the tune so removing the hardware is a solid way to fix it.
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Old 09-15-2018, 09:48 AM   #11
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Quote:
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Lol, not sure why you're getting emotional about it. I'm letting OP know morons like your come on here and bash tuners for absolutely no reason with no basis, far better info than you have given.

Lol and what advice have you given besides, "I dont know what the issue is so take it back to stock and if that doesn't work take it to the dealer to fix it. It happens maybe 1/4 of a time, I think, so its definitely happening to you." Mind blowing advice, you said it's a problem with the tune so removing the hardware is a solid way to fix it.
If its a bad sensor then the issue will persist if he goes back to stock. If its a tune or intake issue then going back to stock proves thats the issue. Its a free and foolproof way to diagnose the issue. You have been here less than 2 years and think you know it all, its clear you are new to this and just repeat crap you learned recently.
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Old 09-15-2018, 12:22 PM   #12
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If its a bad sensor then the issue will persist if he goes back to stock. If its a tune or intake issue then going back to stock proves thats the issue. Its a free and foolproof way to diagnose the issue. You have been here less than 2 years and think you know it all, its clear you are new to this and just repeat crap you learned recently.
Great. Explain what this issue in anyway has to do with, "but the tuner will tell you to throw a pile of parts that rarely ever fail at it instead of doing the right thing and telling you to put the stock intake back on and get it retuned."

Or, just admit you were talking out your ass because of some deep seated vendetta over some tuner from 10 years ago.
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Old 09-15-2018, 12:52 PM   #13
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Quote:
Originally Posted by GlarryHoodDIT View Post
Great. Explain what this issue in anyway has to do with, "but the tuner will tell you to throw a pile of parts that rarely ever fail at it instead of doing the right thing and telling you to put the stock intake back on and get it retuned."

Or, just admit you were talking out your ass because of some deep seated vendetta over some tuner from 10 years ago.
This problem he has is nothing new. There have been literally hundreds of times over the years (that you have not been here) that this issue has came up. It has nothing to do with a specific tuner. Aftermarket intakes rarely ever scale correctly and most use oiled filters that throw the maf voltage off even more. Little things like how deep you put the filter over the tube can affect the scaling and throw things off. Is this 100% guaranteed the issue? No, but its by far the most likely cause By a wide margin.

And again, you come in and offer no help and just want to stalk me like a weirdo.
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Old 09-15-2018, 01:01 PM   #14
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Can we get over attacking each other and actually be of help to the OP! The causes for running rich on bank 1 can be many.. could be a leak in your air intake system (from MAF sensor all the way to heads..) so do a smoke test to find that out. If indeed you don't have a leak, the next step is cleaning your sensors (also check is they are connected tightly or that there isn't any moisture in those connections). I had this happen once, and it ended up being a disconnect MAP sensor (the one that sits on top of your intake manifold right bellow the engine cover (very easy to bump it when messing with your TMIC etc..) I don't really like the AEM air intake, as it seems to have more issues than it is worth. If you still have the stock unit, I would recommend replacing it (just skip the jug part ;-). Get some CRC MAF cleaner and do a cleaning (let it dry for a bit and test). It very well could be the tune, yet I would probably say it is due to your AEM intake. good luck and keep us posted !!
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Old 09-15-2018, 01:32 PM   #15
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Quote:
Originally Posted by n2oiroc View Post
This problem he has is nothing new. There have been literally hundreds of times over the years (that you have not been here) that this issue has came up. It has nothing to do with a specific tuner. Aftermarket intakes rarely ever scale correctly and most use oiled filters that throw the maf voltage off even more. Little things like how deep you put the filter over the tube can affect the scaling and throw things off. Is this 100% guaranteed the issue? No, but its by far the most likely cause By a wide margin.

And again, you come in and offer no help and just want to stalk me like a weirdo.
If that's the case, then why was your entire post bashing tuners. You didn't add anything constructive until you said so to me and realized the overwhelming hypocrisy that your first post did nothing to help.

Love how to you join date = first date ever on nasioc, statement is dumb enough by itself it shouldn't have to warrant me telling you. You joined over a decade ago and are still afraid of stage 2

How is posting on a forum I post on daily stalking? Why do you take NASIOC so personally? Regardless I'm done, you clearly have some personal issues you need to address.
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Old 09-15-2018, 10:28 PM   #16
cky625
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FA20DIT only. Hope this help.
Check
1. Fuel injector and harness between ECM & fuel injector connector. (You need a multi meter, connector(E185)pin[11-12][23-24][35-36][47-48]1.89-2.31ohm, [pin-ground]>1M ohm)
2. Intake/Exhaust system(for holes, loose bolt and loose hose)
3. Fuel pressure(be careful of spill 49-58psi)
4. Engine coolant temperature sensor.(need SSM or AP, 75C+)
5. Mass air flow(MAF) and intake air temperature (IAT) sensor.(need SSM or AP, MAF 2.0-5.0g/s, IATSensor#11 value = -10-50C less ambient temp)
6. Inspect PCV valve and hose assembly and clamp.
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Old 09-17-2018, 06:18 AM   #17
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Considering OP's car is nearly brand new and EVAP parts don't fail often on these cars, and your only mod is the biggest one that should be avoided... start small without having to replace any big parts.

Remove the intake, reinstall the stock unit, clean the MAF, and either flash an OTS Stage 1 tune into the car and see how it drives, or as was previously mentioned, unmarry the Accessport and flash it back to stock to see if the code returns. If it's a hard part that failed, you MAY be able to get it fixed under warranty with no cost to you. If it isn't a failure, then that rules out the two smoking guns: the intake sucks and hurts you more than helps (which, unfortunately, is incredibly common on these cars due to the sensitivity of the intact tract to the turbo and MAF), or your "protune" was poorly done and runs excessively rich.

Genuinely though, either way, ditch the intake. They cause more headaches than horsepower, and are a gateway to a ton of stupid little issues on these cars. You won't need an intake change until you're far above the 300whp mark for it to be worthwhile.
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Old 09-23-2018, 03:46 PM   #18
Aaron N Sky2017
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Default Having similar issues

The cars completely stock and I have a check engine light for P0171 bank 1 is running lean I had a car accident last month and it was on the right hand side
Not sure were to start I heard everything from fuel injectors, Mass A/F sensors, turbo vacuum lines, Intake Manifold Gaskets, to faulty O2 sensors
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Old 09-23-2018, 04:35 PM   #19
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The cars completely stock and I have a check engine light for P0171 bank 1 is running lean I had a car accident last month and it was on the right hand side
Not sure were to start I heard everything from fuel injectors, Mass A/F sensors, turbo vacuum lines, Intake Manifold Gaskets, to faulty O2 sensors
if it only showed up after the accident, have insurance deal with it.
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