Tuned by Scott Siegel when he was down here at s&r performance. Throwing this code. o2 sensor is good. According to s&r, the wiring leading up to the ecu is good. They are pretty sure its the ecu, of course not even Subaru can test to see if the ecu is bad or not. I guess the car is running good, but im still afraid to drive the car much. Any ideas?


Thanks guys.

Matt

 

after i did my 30r and was having problems, i took the car to mastro and they said the same thing, lol. we think its your ecu but in order for us to test it we have to buy another ecu and if its not the problem your stuck with the bill... dual ecu setup guys?

it ended up being my MAF in backwards.. might wanna check that.

 

Let's start from the beginning. We put the car onto the Dyno we start datalogging and found the front O2 sensor was not reading.
We pulled out the O2 and found it bent badly!!!! From the last shop.
We installed the new O2 and it was fine for the duration of the Dyno tuning.
After the last run CEL came on.

We did alot of testing and the bottom line is we found the Voltage swinging from 5.5 to 8.5 at the ECU plug itself. The ECU sending out a signal of 2.8 volts.

Plane and simple the ECU is not seeing O2.

If any body has a solution please let me know.

 

My thoughts are that the O2 was bent so bad that it shorted out

 

that definetely makes sense, i wasnt doubting s&r's judgement at all. great guys and everyone seems very skilled in what they do. of course you understand why im just second guessing, dont want to pay for a new ecu and it not be the problem. is there a relay the power would go to before it hits the ecu?

 

I remember noticing that the front o2 sensor shares a power wire in common with another sensor, don't remember which.

Did you guys ever figure out the problem with the cigarette adapter? That blew out at the same time as the o2 CEL came on while SS was tuning, does it possibly have anything to do with that?

 

find another 06 sti with similar mods and and swap ecu's? i think matt said over on fs when they put a standalone in it fixed the problem, definitely have another set of eyes check the wire routing.... shit always looks the same when u look at it for so long

 

cant swap ecu's. they are all keyed now. first thing we thought about.

 

are you able to get a a/f reading from the ecu via your tuning software?

 

im not using tuning software, its opensource tuned.