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Old 07-07-2002, 01:57 AM   #1
Scooby Newbie
Member#: 1955
Join Date: Jul 2000
Default tec-3 ego sensor problem

Today I just finished installing my tec-3 and it was running great. I went for an hour ride just to check and start to tune. It was all good all my sensors were working. I took the car to work, when I came out of work and started the car my ego was not showing a voltage. When I got home I checked the voltage -- nothing. How do you know if the ego is bad?

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Old 07-07-2002, 12:52 PM   #2
Scooby Specialist
Member#: 4544
Join Date: Feb 2001
Location: santa rosa, ca, usa
2004 STi Aspen White
Bone Stock for now



Where did you get your base maps from? Could you lend some advice to my Tech about locations for the goodies when the time comes for my installlation? How strong did it feel? Are you running boost? How much boost are you running with the TEC 3? Sorry for all of the questions but I gotta know...

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Old 07-07-2002, 05:05 PM   #3
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Join Date: May 2000
Chapter/Region: South East
Location: Keeps Bumpers Fresher, Longer!
05 LGT Wgn; 04 FXT
BDSM -- Birmingham, AL


Check out the harness that goes from the EGO sensor to the vishnu supplied wires. (before the TEC)

I also was getting no signal from my EGO and I looked under my intercooler and sure enough, one of my wires had come loose from the harness.

I went to AutoZone and bought a package of "GM electrical connectors" for 10 bucks and I fixed it myself (BTW, the TEC's use a GM 4wire heated oxygen sensor).

I hope this helps....
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Old 07-07-2002, 06:16 PM   #4
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Member#: 1838
Join Date: Jul 2000
Chapter/Region: NWIC
Location: WA
2000 Impreza RS BRP
Vishnu Turbo/Tec3


I am having the same type problem that you describe for about a week now.

My 02 sensor was working just fine for about a week with the Tec3.

Now it works fine when the car is cold or at idle. But as soon as you drive the car at normal driving temps as soon as it runs for 5 min or so above EGT's of 1300 or up than the sensor voltage drops to .1 -.0 and will not work again until the sensor is cold again. I put in another 02 to check when the car is hot and it works fine. Put the first 02 sensor back in when it is still hot and it shows no voltage.

Seems my 02 sensor is dead once it worms up.

I am going to try to talk to Shiv Monday to see if it could be anything else than a bad 02 sensor.

Went to Shucks to see how much for a 4 wire heated GM O2 and it wad about $70. I can't keep going through these things, they are too expensive.

BTW, Shiv is not supplying the GM o2 sensor with the tec anymore, he wants you to use the stock subaru sensor which I had to and now it is toast.
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Old 07-07-2002, 09:28 PM   #5
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Member#: 7089
Join Date: May 2001
Chapter/Region: NWIC
Location: Western Wa
2016 STi

Default Re: tec-3 ego sensor problem

Originally posted by rangere7
How do you know if the ego is bad?
Splice into the leads a couple inches infront of the actual o2 sensor and hook up a multimeter.

If you go for a drive and you have voltage, the actual sensor is probably good and your problem is in the wiring.

If you have no voltage, then the sensor is bad.

Of course, if you're using one of shiv's maps, you should probably expect 1.01 - 1.03 volts on a normal 1volt o2 sensor

What car is this on? What kind of o2 sensor? How did you wire it up (is it still connected to the ecu/obd2, and could you check the obd2 readout for o2 info)? I left my rear o2 sensor wired up to the stock ecu and the tec3, so I can still get o2 info from the obd2 scanner.
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Old 07-15-2002, 09:19 AM   #6
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Member#: 1955
Join Date: Jul 2000

thanks austin it was bad. i put in a good bosh four wire and it runs like a champ now.

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