NGK OZA603-EN7-94768 Oxygen Sensor 94768 Overall Length 271mm

【NGK OZA603-EN7-94768 Oxygen Sensor 94768 Total length 271mm O2】
■Product Description
NTK O2 Sensor for Detecting Ideal Air-Fuel Ratio
Sophisticated control is required to reduce harmful substances (HC, CO, NOx) in exhaust gases, and O2 sensors play an important role in detecting the oxygen concentration in exhaust gases and providing feedback to the ECU*1.
NTK O2 sensors detect the oxygen concentration in exhaust gases and provide feedback to the ECU so that the air-fuel mixture ratio (air-fuel ratio) is the optimal stoichiometric air-fuel ratio of "λ (lambda) = 1*2". The ECU uses the signal from the O2 sensor to control the air-fuel ratio near the stoichiometric air-fuel ratio, which most effectively purifies harmful substances in the exhaust gas, by making the fuel leaner when it is too rich (rich) relative to the stoichiometric air-fuel ratio, and richer when it is too lean (lean). Thus, NTK O2 sensors are important components 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 provide feedback 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 air-fuel ratio 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 other than the stoichiometric air-fuel ratio (λ=1), such as lean-burn control. In addition, 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 achieve early activation (starts operating within 5 seconds after the engine key is turned ON) through an integrated structure of the element and heater.
【Necessity of Replacement】
O2 sensors are constantly exposed to exhaust gases exceeding 600°C and accumulate combustion products, operating in a very harsh environment.
Using a deteriorated or damaged O2 sensor can lead to various problems.
More than 5 years or 80,000 km since new*
*Varies depending on vehicle usage.
Overall length: 271mm
The overall length is the length from the gasket to the tip of the connector.

■Notes on Images
*Images are for illustration purposes only. Includes products of different sizes and colors. Product designs and specifications may change without notice. Please be aware.

■Precautions
O2 sensors are designed specifically for each vehicle model and engine, so they are not interchangeable with other types.
(1) Always stop the engine before inspecting, replacing, or adjusting.
(2) Inspect and replace according to the service manual of each automobile manufacturer.
(3) Use the correct part number O2 sensor described in this document.
(4) It may not function properly if used in modified vehicles, etc.
(5) Be careful as dropping or impacting the sensor may crack the internal ceramic element.
(6) Anti-seize compound is applied to the threaded part of the sensor. To prevent adhesion of dirt, etc.,
remove the protective cap immediately before installing the sensor.
(7) Do not wipe off the anti-seize compound.
(8) If anti-seize compound gets on your hands, etc., wash it off immediately with water.
➈ Do not twist or bend the lead wires fixed to the main body.
➉ Do not use an impact wrench when installing the sensor.
(11) When installing the sensor, screw it in with your fingertips, then use a wrench and tighten it to the following tightening torque as a guide.
【Part numbers starting with "LZA", "OZA", "OZR", "UAR"】:
Sensor with thread diameter 18mm, pitch 1.5mm, Hex 22mm = approx. 45-55N・m (4.5-5.5kgf・m)
(12) Do not allow the lead wires or connectors to come into contact with the exhaust manifold or other hot parts.
(13) Route the lead wires in the same way as the original and firmly attach the connector.
(14) Depending on the condition of your vehicle, 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.