Attentive to the needs of the market and the repairer, and NGK, leading candle maker, ignition cables and oxygen sensors of the world, clarifies myths and truths about the oxygen sensor, also known as lambda probe, marketed in Brazil under the NTK brand also in the aftermarket. The oxygen sensor is one of the components of the electronic injection system and is responsible for identifying the condition of the air and fuel mixture that was burned, sending this information to the vehicle control unit (ECU). With the data received, this module checks the need to correct the mixture to promote a better relationship between engine performance., fuel consumption and emission control. On vehicles with a Flex system, the probe still plays the role of assisting the module to identify the fuel being used. despite its importance, the oxygen sensor still generates many doubts for the repairman, and in many cases we find incorrect information on this item on the market. No market, some main types of lambda probes are found.. Between them, the thimble type, which can be with a conventional heating system or with a rapid heating system - which starts functioning after eight seconds. beyond them, the chip-shaped sensor is also sold, known as Planar. A recurring question in the repair market is whether all Flex vehicles use planar-type oxygen sensors, In fact, in addition to this type of probe,
mais de 50% da frota circulante dos carros flex utilizam sensores do tipo dedal de aquecimento rápido.
Para a correta aplicação no veículo a NTK recomenda que o reparador consulte sempre a sua tabela de aplicação que está disponível em seu site www.ngkntk.com.br ou através de seu SAC 0800 197 112.
Tips and care Internally, the probe is made of special ceramics, therefore, impacts must be avoided during transport and handling, at risk of damaging the sensor, even new, during its installation and removal process. The oxygen sensor wire must not be spliced, because splices make it difficult to pass the sensor's reference oxygen, as well as allow water infiltration and bad electrical contact. The application of products such as spray oil, clean contact or the presence of oil and water in the connector contaminate the reference air, what affects the correct functioning of the oxygen sensor. Another attitude to be avoided is the removal of the grease that is applied to the oxygen sensor thread. NTK sensors have a special grease called Never Seeze that prevents oxidation, improves grounding and facilitates installation and de-installation. Resistant to high temperatures (
acima de 1.300 graus Celsius) this grease must not be replaced by other types of lubricants that can melt and contaminate the sensing element or even ignite due to high temperatures. Another precaution to be taken is not to pull the sensor by the wires, as an internal break in the wiring can cause bad electrical contact.. This type of procedure may also displace the seal., enabling water infiltration. To remove the probe, first disconnect the sensor and then unscrew it from the vehicle. When trying to remove the sensor first, the wire can be damaged by twisting or pulling. Some vehicles have specific locations for passing the sensor wire. You must pass the wires through the loops to prevent them from becoming loose, allowing them to be damaged by friction or contact with heated engine parts. During installation,
o torque de aperto do sensor recomendado é de 3,
5 a 4,
5 Kgfxm, if we let the sensor come loose and allow gas to escape. too tight, there is also a risk of damaging the sensor. Appropriate tools for removing and installing oxygen sensors can be found on the market. There is no maintenance of oxygen sensors and in case of malfunctions and slow response time, they must be replaced. You should also not attempt to clean them to avoid shocks or removal of applied grease from the sensor thread..
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