Seller notes

Package Include:2 pieces Length:Length of Sensor 1：310mmLength of Sensor 2:330mm OE:234-9119 234-4350 Q&A: Q:What is Differences Between upstream and downstream O2 Sensor? A: The upstream oxygen sensor is located before the catalytic converter. This measures the level of pollutants coming directly from the engine. It also senses any raw, unburned fuel coming from the combustion chambers. The downstream oxygen sensor is located directly after the catalytic converter. This sensor measures the po...

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