LTFT High after Tomei Header install

[alphasaur]

Originally Posted by DylanJZA

Might be waiting forever for that one unfortunately (at least in terms of US). Given Cobb is pulling support for a ton of stuff and ECUtek is owned by the same parent company... Was talking to the shop working on my Supra, primarily a Subaru centric shop, and they told me all kinds of things going on right now that are super unfortunate.

(article for anyone not already aware: https://www.thedrive.com/news/cobb-l...rs-are-furious)

oh no.

[ChesterV]

Originally Posted by sds

Not sure about this gen BRZ, but many cars use the secondary O2 sensor (post-cat) to tune LTFTs. Running a defouler is going to affect that.

Speaking of the secondary O2 sensor. It reads 0v on idle. It only goes up at .800mv when reving the car.

So to compare LTFT and Downstream
LTFT is at +20 on idle however goes back down to 0 on throttle.
Downstream Sensor is at 0v but goes up to normal voltage 800mv when on throttle.

I also have a jstyle defouler on the secondary O2 to fool the PCM to pull up p0420.

I'm starting to think that my downstream O2 is dead as when I make the switch the sensor was basically just free/lose around the O2 slot

Could have really killed that

[sds]

Originally Posted by ChesterV

Speaking of the secondary O2 sensor. It reads 0v on idle. It only goes up at .800mv when reving the car.

So to compare LTFT and Downstream
LTFT is at +20 on idle however goes back down to 0 on throttle.
Downstream Sensor is at 0v but goes up to normal voltage 800mv when on throttle.

I also have a jstyle defouler on the secondary O2 to fool the PCM to pull up p0420.

I'm starting to think that my downstream O2 is dead as when I make the switch the sensor was basically just free/lose around the O2 slot

Could have really killed that

It shouldn't read in a binary fashion like that...I'm wondering if it's been burnt up or otherwise damaged.

[ChesterV]

Originally Posted by sds

It shouldn't read in a binary fashion like that...I'm wondering if it's been burnt up or otherwise damaged.

The reason I think it's damaged because when I did the switch. It was literally lose on the O2 slot and who knows how long it's been wobbling like that since I installed it.

[ChesterV]

It's still the same symptoms after installing my stock headers.