Mazda CX-7 2.5L Rear Oxygen Sensor L556-18-861 2344466 Direct Fit Replacement

This replacement part is essentially equivalent to the original in material and process, using a high-temperature ceramic substrate and corrosion-resistant stainless steel housing; bench-tested for durability and can match OEM standards. OEM numbers L556-18-861, 2344466, L55618861A, fit Mazda CX-7 2.5L models. Function: monitor exhaust oxygen content and feed ECU to adjust the air-fuel ratio to meet emissions standards and stabilize fuel economy. Replacement is an OEM-location swap; simply remove the old part and plug in the harness. Moderate-to-low difficulty, but recommend cold-start operation and clean threads to avoid cross-threading.