NGK OZA603-EN4-90489 Oxygen Sensor 90489 Total length 371mm

【NGK OZA603-EN4-90489 Oxygen Sensor 90489 Total Length 371mm O2】
■Product Description
NTK O2 Sensor detects ideal air-fuel ratio
Advanced control is necessary to reduce harmful substances (HC, CO, NOx) in exhaust gases, and O2 sensors play an important role in detecting the oxygen concentration in the exhaust gas and feeding it back to the ECU*1.
NTK O2 sensors detect the oxygen concentration in the exhaust gas and feed it back to the ECU so that the fuel-air mixture ratio (air-fuel ratio) reaches the optimal stoichiometric air-fuel ratio of "λ (lambda) = 1*2." If the signal from the O2 sensor indicates that the fuel is rich relative to the stoichiometric air-fuel ratio, the ECU thins the fuel, and if it is lean, it enriches the fuel. This controls the engine near the stoichiometric air-fuel ratio, where harmful substances in the exhaust gas are most effectively purified. Thus, NTK O2 sensors are an important component in reducing harmful substances in exhaust gases.

Specifications
【Features and Structure】
Zirconia elements have the characteristic of generating electromotive force due to differences in oxygen concentration at temperatures exceeding 300°C. Utilizing this characteristic, zirconia-type sensors detect the difference in oxygen concentration between the inside and outside of the element (atmosphere and exhaust gas) and feed back to the ECU whether the fuel is rich or lean relative to the stoichiometric air-fuel ratio.
Wideband air-fuel ratio sensors can detect how rich or lean the mixture is relative to the stoichiometric air-fuel ratio. Therefore, more precise engine control is possible than with zirconia O2 sensors. It also enables engine control outside the stoichiometric air-fuel ratio (λ=1), such as lean-burn control. Additionally, there are early-activation wideband air-fuel ratio sensors that maintain the characteristics of conventional wideband air-fuel ratio sensors while improving heat resistance and durability, and have an integrated element and heater structure to achieve early activation (starts operating within 5 seconds after the engine key is turned ON).
【Necessity of Replacement】
O2 sensors are constantly exposed to exhaust gas exceeding 600°C and operate in a very harsh environment where combustion byproducts adhere to them.
Using a deteriorated or damaged O2 sensor can lead to various problems.
More than 5 years or 80,000 km from new car*
*Varies depending on the vehicle's usage conditions.
Total length: 371mm
Total length is the length from the gasket to the tip of the connector.
Compatible Manufacturer: Nissan
Compatible Genuine Part Number: 22690-EN200

■Image Disclaimer
*Images are for illustration purposes only. Includes products with different sizes and colors. Product designs and specifications are subject to change without notice. Please understand.

■Precautions
O2 sensors are designed specifically for each vehicle model and engine, so they are not interchangeable with other types.
(1) Always turn off the engine before inspection, replacement, or adjustment.
(2) Perform inspection and replacement according to the service manual of each automobile manufacturer.
(3) Use an O2 sensor with the correct part number as specified in this document.
(4) It may not function correctly if used in modified vehicles, etc.
(5) Be careful as dropping or impacting the sensor may cause the internal ceramic element to break.
(6) Anti-seize compound is applied to the threaded part of the sensor. To prevent adhesion of dirt, etc.,
remove the protective cap just before installing the sensor.
(7) Do not wipe off the anti-seize compound.
(8) If the anti-seize compound gets on your hands, etc., wash it off immediately with water.
(9) Do not twist or bend the lead wire fixed to the main unit.
(10) Do not use an impact wrench when installing the sensor.
(11) When installing the sensor, screw it in by hand, then use a wrench to tighten it to the following approximate torque:
【Part numbers starting with "LZA", "OZA", "OZR", "UAR"】:
Sensor with thread diameter 18mm, pitch 1.5mm, Hex 22mm = approx. 45-55 N・m (4.5-5.5 kgf・m)
(12) Do not allow the lead wires or connectors to touch the exhaust manifold or other hot parts.
(13) Route the lead wires in the same way as the original and securely attach the connector.
(14) Depending on the vehicle's condition, replacing only the O2 sensor may not resolve the problem.
(15) When the MIL illuminates, before (or after) replacing the sensor, follow the service manual, etc., and
be sure to clear (reset) the diagnostic (self-diagnosis/OBD) error codes.
Failure to clear the error codes may lead to problems such as the MIL not turning off.