NGK NTK UAA0004-MM004 / UAA0004MM004 / 91621 Lambda Oxygen Sensor Genuine NTK Component

A genuine NTK oxygen (lambda) sensor from NGK Spark Plugs, the world's leading maker of lambda sensors and original-equipment supplier to most vehicle manufacturers. The sensor measures the oxygen left in the exhaust so the engine management can keep the fuel mixture correct, which protects the catalytic converter and keeps fuel economy and emissions where they should be.NGK specificationPart numberUAA0004-MM004Stock number91621Specification data supplied by NGK Spark Plugs (UK).