Downstream Oxygen Sensor 4-Pin For Subaru Forester Outback WRX Ascent Legacy (2014-2020, 2.4L/2.0L) - B1S2

Is your Subaru throwing a check engine light for the downstream O2 sensor?

This is the fix.

It's a brand new, direct-fit 4-pin oxygen sensor designed for a bunch of Subaru models like the Forester, Outback, Legacy, Ascent, and WRX from 2014 to 2020 with the 2.4L or 2.0L H4 engines.

This is the B1S2 (Bank 1 Sensor 2) position.

It comes with a stainless steel protective sleeve and a wire harness, all ready to bolt in.

It's got triple sealing tech and dual laser welding, so it's built to last and resist corrosion and high heat.

Plus, they claim a +150% power gain?

That's probably a bit optimistic, but it'll definitely get your fuel trim back to where it should be.

One year warranty included.