NGK 21579 NTK OE Type Oxygen Sensor, 4-Wire Heated O2 Sensor

The NGK NTK 21579 is an OE type oxygen (O2) sensor. It monitors the oxygen content of the exhaust stream and sends that data to the engine control unit (ECU). The ECU uses the signal to adjust the air/fuel mixture, which helps keep the engine efficient, lowers emissions, and protects the catalytic converter.

Key Features:

• Sensor type: Heated, narrow-band switching zirconia design with a 0-1 V output range
• Wiring: 4-wire design with a 14.75 in (375 mm) wiring harness and an oval female connector
• Installation: Thread-in mounting with metric threads (18 mm) and a 7/8 in (22 mm) hex size
• Fast light-off: The integrated heater and NTK technical ceramic sensing element reach operating temperature in seconds. This allows quicker closed-loop activation and lower cold-start emissions.
• Protective design: The damage-tolerant housing shields the ceramic element from silicone and lead poisoning. A porous PTFE filter lets atmospheric oxygen in while keeping water and engine grime out.
• OE-level quality: Built to OE standards with close tolerances to support emissions compliance, and each sensor goes through a multi-step test process

Cross-references: DENSO 234-4763; GM 12627139, 12643707, 12645561, 12655677, 12666673, 55569902.

A new NTK oxygen sensor can help restore fuel economy and engine performance and extend catalyst life. NTK is a leading supplier of OEM oxygen sensors.