Welcome to the North American Subaru Impreza Owners Club Tuesday May 11, 2021
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 03-03-2020, 02:04 PM   #1
frugalrhombus
Scooby Newbie
 
Member#: 494291
Join Date: Nov 2018
Location: Broward County, FL
Vehicle:
2019 STI
Dark Gray

Default Cobb Ethanol Sensor going bad after a year

OK so I have a 2019 STI that I have been running flex fuel for about a year (still trying to track down a receipt to figure out exact date). A few times in the past few months I had an issue where I would start the car and the ethanol level would be reading 0.0 and I assume my tune was adjusting for that and it was idling around 15.5 AFR but it would fix itself by just turning the car off and waiting a few minutes and restarting it.

But yesterday it did it to me while I was driving on the highway, it went from 76% which is what I filled up at and spiked to 100% then dropped to 0.0 again. I immediately threw it in neutral and as I was coasting for somewhere to pull over it went back to normal.

I have been talking to a few people about this locally and they said that the ethanol sensor itself is actually just a GM sensor and its the rest of the kit that is made by Cobb. Does anyone know if this is true? I would rather not pay the $300 for a replacement from Cobb if it has been after a year and the warranty is over if it is going to take a **** after a year again.

Also if it is true does anyone have a part number?
frugalrhombus is offline   Reply With Quote
Old 03-03-2020, 02:05 PM   #2
frugalrhombus
Scooby Newbie
 
Member#: 494291
Join Date: Nov 2018
Location: Broward County, FL
Vehicle:
2019 STI
Dark Gray

Default

I should add that I do not believe it is the entire harness which several people have suggested because it is not throwing any codes, it is simply going down to 0.0 on both raw ethanol and final ethanol
frugalrhombus is offline   Reply With Quote
Old 03-03-2020, 03:24 PM   #3
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default

Yeah it's just a gm sensor. Buy one from Cobb return the broken one clean her up good and get your money back.
spoolinsti05 is offline   Reply With Quote
Old 02-26-2021, 11:26 PM   #4
Dave D.
NASIOC Supporter
 
Member#: 130990
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Menzel Lake, WA
Vehicle:
06 Red Ltd.Wagon
Dom 1.5xtr JJ tuned

Default

Quote:
Originally Posted by spoolinsti05 View Post
Yeah it's just a gm sensor. Buy one from Cobb return the broken one clean her up good and get your money back.

This. They fixed the exact same issue with my build.
Dave D. is offline   Reply With Quote
Old 03-03-2020, 03:25 PM   #5
neg_matnik
Scooby Specialist
 
Member#: 132389
Join Date: Nov 2006
Chapter/Region: BAIC
Location: SF Bay Area
Default

From what I can see, it looks like GM uses at least 3 different sensors, all 3 at around $100.
Two of them are actually made by Continental and I'm not sure about the 3rd one.
Summit Racing 13577394, 13577379, 13577429.
neg_matnik is offline   Reply With Quote
Old 03-04-2020, 11:18 AM   #6
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default

Quote:
Originally Posted by neg_matnik View Post
From what I can see, it looks like GM uses at least 3 different sensors, all 3 at around $100.
Two of them are actually made by Continental and I'm not sure about the 3rd one.
Summit Racing 13577394, 13577379, 13577429.
All you need to know is the resistance value of the Cobb and the GM if they're equal they will be interchangeable even if the plug is different.. just wire in the new plug.
spoolinsti05 is offline   Reply With Quote
Old 03-04-2020, 11:28 AM   #7
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default

Cobb should provide you with this info so you can test the sensor with a DVM

The gm info will be hard to get. You'd need a fsm. Or can go to the dealer and bring your DVM and test them right at the counter. To determine the sensor you need to buy.
spoolinsti05 is offline   Reply With Quote
Old 03-04-2020, 01:45 PM   #8
frugalrhombus
Scooby Newbie
 
Member#: 494291
Join Date: Nov 2018
Location: Broward County, FL
Vehicle:
2019 STI
Dark Gray

Default

Quote:
Originally Posted by spoolinsti05 View Post
Cobb should provide you with this info so you can test the sensor with a DVM

The gm info will be hard to get. You'd need a fsm. Or can go to the dealer and bring your DVM and test them right at the counter. To determine the sensor you need to buy.
They haven't told me anything yet but I can ask. They want me to get a log of when it is happening again but of course as soon as they told me what to capture in the log it hasn't happened again since lol
frugalrhombus is offline   Reply With Quote
Old 03-04-2020, 02:50 PM   #9
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default

Quote:
Originally Posted by frugalrhombus View Post
They haven't told me anything yet but I can ask. They want me to get a log of when it is happening again but of course as soon as they told me what to capture in the log it hasn't happened again since lol
Lol ask them for the values on the sensor then test it. You might be getting some sort of interference also.
spoolinsti05 is offline   Reply With Quote
Old 03-04-2020, 05:28 PM   #10
djoye
Scooby Specialist
 
Member#: 50072
Join Date: Dec 2003
Chapter/Region: South East
Location: TN
Vehicle:
2017 STI
Blue

Default

https://www.amazon.com/dp/B01GQR9C5O...v_ov_lig_dp_it

The linked sensor was referenced on the Cobb site in the reviews from another person that had a failed sensor. This sensor supposedly can replace it.
djoye is offline   Reply With Quote
Old 02-26-2021, 10:35 PM   #11
Iwonthedeadpool
Scooby Newbie
 
Member#: 522653
Join Date: Feb 2021
Location: Michigan
Vehicle:
2007 Sti
Green

Default part number

having a similar issue with my 07 sti can anyone tell me or link me an interchangeable part number so i can buy a new sensor? ive tried searching and get overwhelmed with the different ones available. dont want to spend unnecessary money.
Iwonthedeadpool is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 10:18 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2021 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.