u/Frequent_Cat_8979

I smoke tested my 2017 sti from the mid pipe. Been getting p2270 code. I have Cobb high flow down pipe. No leakes in exhaust but small leak coming from watergate rod. Is this normal and does anyone have any advice for the p2270 code. Brand new O2 sensor af ratio is 14.4 - 14.7 at idle and cruising. This is driving me mad