NGK NTK 21531 Oxygen Sensor O2 Sensor Downstream 4-Wire 18mm

The NGK NTK 21531 oxygen sensor (also called an O2 sensor) is an OE-type replacement. It monitors the oxygen content of the exhaust and sends that data to the engine control unit. The ECU uses it to manage the air/fuel mixture, which supports efficient combustion and low emissions.

Key Features:

• Sensing element made with NTK technical ceramic and an integrated heater. It reaches operating temperature quickly, so closed-loop control starts sooner and cold-start emissions are lower.
• Protective coating on the sensor element.
• Every sensor goes through a 3-test process for quality and durability.
• Built to the same fit, form and function as the original equipment sensor.
• 4-wire design
• 18mm thread diameter
• Wiring harness length of about 41.25 inches

Cross-References: This sensor is listed as a replacement for ACDelco 213-3010, Bosch 16064, 16175, 16200, 16447 and 16624, Delphi ES10732 and ES20115, DENSO 234-4822, 234-4867, 234-4910 and 234-4913, General Motors 9182000, and Saab 4570917 and 55353149.

NTK supplies original equipment oxygen sensors to automakers worldwide. A new sensor helps restore fuel economy, engine performance and emissions compliance, and helps protect the catalytic converter.