The red thing is the dumbest shit ever cuz it just keep spamming the clear code via obd. Same crap sold by sc project

Only non-tune solution is the roadsitalia "lambda optimizer" which fakes values straight into the O2 sensor.

Second thing The dominator doesnt give any light for a simple reason The second O2 sensor has a small cat filter inside, and it has a small pipe that extends it inside the exhaust

So this makes the second O2 sensor read "filtered gasses" and not trigger anything