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The Green Spark Plug Company£49.96Visit shop Ngk / Ntk Oza816-Ee4 / 91225 Lambda / Oxygen Sensor Zirconia O2 Exhaust Probe New Ngk-Oza816-Ee4 Size 45
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The NTK OZA816-EE4 Lambda Sensor is an essential component for automotive technicians and DIY enthusiasts looking to maintain precise air-fuel ratio control and improve vehicle emissions. By providing real-time data to the engine control unit, this sensor ensures optimal fuel efficiency and protects the catalytic converter from premature failure, though it requires specific knowledge of engine sensors and proper installation torque to function correctly.
| Model Part Number | 91225 |
|---|---|
| Brand | NTK |
While there is no fixed interval, many manufacturers suggest inspecting the sensor every 30,000 to 50,000 miles, or replacing it if performance drops.
It is generally not recommended. Contaminants usually penetrate the internal ceramic element, meaning cleaning the surface rarely restores full functionality.
Most NTK sensors come with factory-applied anti-seize, but you should verify this on the specific unit before installation.
Yes, a faulty lambda sensor directly impacts emissions and will usually cause a vehicle to fail an emissions test.
You can technically drive the vehicle, but it will likely run poorly, consume more fuel, and risk damaging the catalytic converter.
Use an OBD-II scanner to clear existing diagnostic trouble codes after the new sensor is installed.
Check the electrical connector for corrosion or loose pins and verify the wiring harness for signs of heat damage.
Apply a high-quality penetrating oil to the threads and allow it to sit for at least 15 minutes before using an oxygen sensor wrench.
Before installation, ensure the engine is cool to prevent burns. Always verify that the OZA816-EE4 is the correct part number for your specific vehicle make and model, as sensor compatibility is critical for proper ECU communication. When installing, use a dedicated oxygen sensor socket and apply a small amount of anti-seize compound to the threads if it is not pre-applied, ensuring not to touch the sensitive sensing element. Handle the sensor carefully, as impacts can damage the internal ceramic structure. Avoid using cleaning solvents or degreasers near the sensing tip.
