NTK is the world's leading supplier of OEM oxygen sensors, supplying more vehicle makers with oxygen sensors than any other manufacturer. NTK oxygen sensors are individually tested to ensure the highest level of quality and reliability.
Everyone agrees the amount of pollution produced by motor vehicles should be reduced. In order to encourage reduced emissions, governments have progressively introduced tougher exhaust gas emission legislation. Since 1981 the majority of cars and light trucks built throughout the world have been equipped with oxygen sensors. NTK oxygen sensors continuously detect the composition of exhaust gases. As the output from the sensor changes the ECU instructs the fuel mixing system to alter the mixture. This ensures the air-fuel mixture is always correct and promotes catalyst efficiency.
A new NTK oxygen sensor can help lower emissions, improve fuel mileage, improve engine efficiency and extend catalyst life.
NTK oxygen sensors are OEM approved and are built with the highest quality materials and the finest craftsmanship to ensure superior quality for your automobile. NTK oxygen sensors meet or exceed original equipment specifications and are equipped with waterproof factory fitted connectors to ensure a perfect fit every time.
Rely on NTK, the World Leader in sensor technology.
Did you know replacing worn or failed oxygen sensors is the best way to protect expensive three-way catalysts or catalytic converters? Failure to replace failed oxygen sensors at the earliest sign of a problem, usually indicated by an illuminated check engine light, can cause premature failure of expensive three-way catalysts or catalytic converters.
What does it mean to have a failed oxygen sensor? When an oxygen sensor fails, it is no longer communicating with the vehicle’s 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.
The role of the three-way catalyst is to convert harmful gasses: carbon monoxide, nitric oxide and nitrogen dioxide (both referred to as NOx) and hydrocarbons to less harmful gases such as carbon dioxide, nitrogen, oxygen and water vapor. To do this, expensive precious metals such as platinum, rhodium and palladium are used to create chemical reactions. Unused fuel (hydrocarbons) is removed by burning inside the oxidation catalyst.
When the vehicle is operating in open-loop mode, the engine will run rich, resulting in much higher levels of unburned fuel. Vastly elevated temperatures inside the oxidation catalyst in the three-way catalyst will eventually lead to a meltdown and a destroyed catalytic converter. Often, once the catalyst has been destroyed, vehicle performance will also suffer, sometimes resulting in an engine that will no longer run because of a plugged exhaust.
Ignoring that check engine light is the worst thing you can do for your three-way catalyst(s). Replacing a failed oxygen sensor at the earliest sign of trouble may save future headaches and higher repair bills.