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NGK Nissan Altima 2011-2007 Direct Fit 4-Wire A/F Sensor 2022-subaru-brz-esi2037407 HKS Universal Aluminum Bend -NTK is the world's largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle's on board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. While conventional switching oxygen sensors only switch rich or lean, wideband oxygen (or Air Fuel Ratio) sensors produce a linear output signal that allows the ECU determine exactly how