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Old 06-26-2019, 07:15 PM   #1
Netzapper
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Member#: 136137
Join Date: Dec 2006
Chapter/Region: RMIC
Vehicle:
2018 STi
Blue and stripey

Default Switched 12V for wideband in 2018 WRX/STI engine bay?

Is there a relatively safe place to tap switched 12V power inside the engine bay of a 2018 STI? Does the TGV connector have a 12V source?

I'm trying to install an AEM inline wideband controller (for lambda sensor in downpipe). The signal will be run into driver's side TGV position input for logging through the ECU using Cobb custom sensor functionality. There is no gauge going in the passenger compartment. I would like to keep everything in the engine bay without going through the firewall.
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Old 06-26-2019, 08:19 PM   #2
Netzapper
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Member#: 136137
Join Date: Dec 2006
Chapter/Region: RMIC
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2018 STi
Blue and stripey

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Probed around on the non-critical fuses, but nothing seems to be on if-and-only-if the car is on.

Cobb tuning seems to get the 12V for their ethanol sensor module from the rear O2 sensor harness. I'm investigating making or ordering a harness with those adapters, but I was kind of hoping to get something going quicker.
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Old 07-02-2019, 08:54 AM   #3
Barge
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Location: Northville, MI
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2004 Forester XT
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Quote:
Originally Posted by Netzapper View Post
Probed around on the non-critical fuses, but nothing seems to be on if-and-only-if the car is on.

Cobb tuning seems to get the 12V for their ethanol sensor module from the rear O2 sensor harness. I'm investigating making or ordering a harness with those adapters, but I was kind of hoping to get something going quicker.
Rear O2 is about the best place in the engine bay.

If you look through the DIY ethanol sensor thread in the tuning area I believe all the part numbers are there to make a harness... provided it's still the same 4 pin they've used for years.
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Old 07-02-2019, 08:58 AM   #4
Turpid Porpoise
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Join Date: Oct 2017
Chapter/Region: MAIC
Location: Lovettsville, Virginia
Vehicle:
2008 Impreza WRX STi
Silver

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Quote:
Originally Posted by Netzapper View Post
Is there a relatively safe place to tap switched 12V power inside the engine bay of a 2018 STI? Does the TGV connector have a 12V source?

I'm trying to install an AEM inline wideband controller (for lambda sensor in downpipe). The signal will be run into driver's side TGV position input for logging through the ECU using Cobb custom sensor functionality. There is no gauge going in the passenger compartment. I would like to keep everything in the engine bay without going through the firewall.
Visconti Tuning Makes a harness for this.
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