NGK OZA751-EE6-91127 Oxygen Sensor 91127 Overall length 325mm

【NGK OZA751-EE6-91127 Oxygen Sensor 91127 Total Length 325mm O2】
■Product Description
NTK O2 Sensor for Detecting Ideal Air-Fuel Ratio
Advanced control is necessary to reduce harmful substances (HC, CO, NOx) in exhaust gas. O2 sensors play a crucial role in detecting the oxygen concentration in exhaust gas and providing feedback to the ECU*1.
NTK O2 sensors detect the oxygen concentration in exhaust gas and provide feedback to the ECU so that the fuel-air mixture ratio (air-fuel ratio) achieves the optimal stoichiometric air-fuel ratio of "λ (lambda) = 1*2." If the signal from the O2 sensor indicates that the fuel is rich compared to the stoichiometric air-fuel ratio, the ECU leans the fuel; if it's lean, the ECU 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 crucial components for reducing harmful substances in exhaust gas.

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 oxygen concentration difference 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 mixture is relative to the stoichiometric air-fuel ratio. Therefore, more precise engine control than with zirconia O2 sensors is possible. It also enables engine control outside the stoichiometric air-fuel ratio (λ=1), such as lean burn control. Furthermore, 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 (start of operation within 5 seconds after the ignition key is turned ON) through an integrated structure of the element and heater.
【Necessity of Replacement】
O2 sensors are constantly exposed to exhaust gas exceeding 600°C and accumulate combustion byproducts, 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 from new*
*Varies depending on vehicle usage conditions.
Total length: 325mm
Total length is the length from the gasket to the tip of the connector.
Compatible Manufacturer: Toyota
Compatible OEM Part Number: 89465-58050

■Notes on Images
※Images are for illustration purposes only. Includes products with different sizes and colors. Product designs and specifications are subject to change without notice. Please be aware.

■Precautions
O2 sensors are specifically designed for each vehicle model and engine type and are not interchangeable with other types.
(1) Always stop the engine before inspecting, replacing, or adjusting.
(2) Perform inspection and replacement according to the service manual of each automobile manufacturer.
(3) Use the correct O2 sensor part number as specified in this manual.
(4) It may not function correctly if used in modified vehicles, etc.
(5) Be careful as dropping the sensor or subjecting it to impact may crack the internal ceramic element.
(6) Anti-seize compound is applied to the threaded part of the sensor. To prevent dust from adhering,
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 wire fixed to the main body.
➉ Do not use an impact wrench when installing the sensor.
(11) When installing the sensor, screw it in by hand, then use a wrench and tighten it to the following approximate torque:
【Part numbers starting with "LZA," "OZA," "OZR," "UAR"】:
Sensors with thread diameter 18mm, pitch 1.5mm, Hex 22mm = approximately 45-55 N・m (4.5-5.5 kgf・m)
(12) Do not allow the lead wires or connector 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 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
always 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.