Seller notes

Package Include:2 pieces Length:Length of Sensor 1：440mmLength of Sensor 2:420mm OE:234-4242 234-4251 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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