This NGK NTK 24851 Air / Fuel Ratio Sensor replaces Bosch 18081, DENSO Auto Parts 234-9109, DENSO Auto Parts 234-9114, DENSO Auto Parts 234-9115, DENSO Auto Parts 234-9128, DENSO Auto Parts 234-9136, DENSO Auto Parts 234-9138, DENSO Auto Parts 234-9141, DENSO Auto Parts 234-9154, DENSO Auto Parts 234-9155, DENSO Auto Parts 234-9161, Spectra Premium OS5579, Toyota 8946704080, Toyota 8946706120, Toyota 8946706130, Toyota 8946706140, Toyota 8946706160, Toyota 8946706180, Toyota 894670E130, Toyota 894670E140, Toyota 894670E170, Toyota 894670E190, Toyota 894670E200, Toyota 894670R050, Toyota 894670T020, Toyota 8946733230, Toyota 8946733260, Toyota 8946748200, Toyota 8946748210, Toyota SU00300425, Subaru 22641AA610, Subaru 22641AA640, Subaru 22641AA66A, Subaru 22641AA670, Subaru 22641AA710, Subaru 22641AA71A, OEM parts and is perfect for replacement or a performance upgrade.
NGK / NTK is the largest manufacturer of oxygen sensors in the world. NTK Oxygen Sensors are designed to maintain optimal fuel efficiency and are supplied with a direct-fit connector similar to those used by the OEM manufacturer for easy installation.
When an oxygen sensor fails, it is no longer communicating with the Engine Control Unit (ECU). The ECU is responsible for strengthening or weakening the fuel delivery through the fuel injectors in order to maintain the most desirable air-fuel ratio, usually close to 14.7 part air to 1 part fuel (14.7:1), also known as the stoichiometric point. When there is no communication between the oxygen sensors and the ECU, the vehicle is programmed to revert to what is known as open-loop mode, in which more fuel is delivered to protect the engine from damage from an over-lean condition. Running in open-loop mode will not only waste fuel, and increase emissions, but will also put undue stress on the three-way catalyst.
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