NGK NTK 25211 Direct Fit Oxygen Sensor, 4-Wire Heated O2 Sensor, 18mm

The NGK NTK 25211 oxygen sensor (O2 sensor) is a direct-fit, heated, 4-wire switching sensor. It measures the amount of oxygen in the exhaust and sends that signal to the engine control unit. NTK makes original-equipment oxygen sensors, and this sensor is an OE-identical replacement.

Key Features:

• Heated switching design: 4-wire heated sensor that warms up quickly to support fuel economy and lower emissions
• 18mm thread diameter with a flange-mount style
• OE-specified connector and hardware: the connector and attaching hardware match the original equipment for easier installation
• Dual-coated platinum element: built for long service life and fast response
• Durable construction: resists corrosion and abrasion
• Wiring harness length: about 10 in. (320 mm)
• 1-year warranty

Oxygen sensors are part of the on-board diagnostic system. They give the ECU constant closed-loop feedback so it can control the air-fuel ratio. They also alert the OBDII system to fuel delivery problems or reduced catalytic converter efficiency. A worn sensor can hurt engine performance, fuel economy and emissions, so replacing it restores accurate air-fuel control.