NGK 25181 Oxygen Sensor - 4-Wire Heated Direct Fit O2 Sensor

The NGK 25181 oxygen sensor (also called an O2 sensor or air-fuel ratio sensor) is a direct-fit replacement. It is built to OE specifications and is sold under the NTK sensor line from NGK Spark Plugs. The oxygen sensor is part of the on-board diagnostic system. It helps the engine run well, supports fuel efficiency and reduces harmful emissions.

Key Features:

• Direct-fit design with a factory-fitted OE-style connector for simple plug-in installation
• Heated, 4-wire switching (zirconia thimble-type) sensor design
• Platinum-coated sensing element for durability
• Thimble-type ceramic element becomes conductive at operating temperature and sends voltage signals to the engine management system to regulate the air-fuel ratio
• Each sensor is tested during manufacturing for quality and reliability
• Plug-in mounting type with push-pull output and ±1% measurement accuracy

NGK is a major supplier of OEM oxygen sensors. The 25181 helps restore proper air-fuel ratio feedback, which supports fuel economy and emissions control. Check the sensor position (upstream or downstream, bank and sensor number) before installing.