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NGK 4‑wire air‑fuel (wideband) sensor for Toyota 4Runner (1999–2002) offers a linear AFR output so the engine computer can continuously tune the air–fuel mixture for efficient combustion and lower emissions. Built by NTK, the sensor employs advanced ceramic element technology and a 3‑stage contaminant‑resistant overcoat to protect against poisoning. It installs as a direct‑fit replacement to restore precise closed‑loop operation.
NGK Toyota 4Runner 2002-1999 Direct Fit 4-Wire A/F Sensor
