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NGK 4‑wire air‑fuel (wideband) sensor for Subaru Impreza (1999–2001) provides a linear AFR output so the ECU can precisely tune the air–fuel mixture, improving combustion efficiency and emissions. The NTK‑built sensor uses advanced ceramic construction and a 3‑stage contaminant‑resistant overcoat to resist element poisoning. This direct‑fit replacement restores accurate closed‑loop feedback and reliable engine control.
NGK Subaru Impreza 2001-1999 Direct Fit 4-Wire A/F Sensor
