NGK 25666 Direct Fit Oxygen Sensor, 4-Wire Upstream O2 Sensor

The NGK 25666 oxygen sensor (also called an O2 sensor or lambda sensor) is a direct-fit replacement sensor from NGK's NTK sensor line. It measures the oxygen in the exhaust stream and sends that signal to the engine control unit. The ECU uses it to keep the air/fuel mixture correct. A new sensor helps restore fuel economy and engine performance, lowers emissions, and helps protect the catalytic converter.

Key Features:

• Direct-fit design that meets OE standards and specifications
• Heated, 4-wire sensor with a 15.75 in. (400 mm) wiring harness
• Waterproof, factory-fitted OE-style connector for simple installation
• Threaded mounting with an 18 mm thread diameter and a 7/8 in. (22 mm) wrench size
• Sensing element made from NTK technical ceramics, a platinum-coated thimble-type design
• Individually tested for quality and reliability
• Upstream sensor position
• 1-year warranty

Specifications:

• Manufacturer part number: 25666
• OEM cross-references: 96412900, 1821286Z02
• UPC: 087295256664
• Item weight: about 0.23 lb
• Item dimensions: about 16.75 x 1 x 1 in.

A worn or failed oxygen sensor can cause poor drivability, higher fuel consumption, and a failed emissions test. Replacing it on schedule helps keep the engine running efficiently and the exhaust clean.