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The NGK OE‑type 4‑wire air/fuel sensor for 2015–2019 Subaru Legacy models is a direct OE replacement that restores accurate air–fuel ratio sensing for the engine control module. Matching the factory sensor’s wiring and fit, it supplies the feedback used for fuel‑trim and emissions control and installs in the original location to address sensor failures or related diagnostic codes.
NGK 2019-15 Subaru Legacy OE Type 4-Wire A/F Sensor
