Buick Royaum 2.8/3.6L 2005-2006 Front Oxygen Sensor 12575904

Buick Regal 2005-2006 2.8L and 3.6L models can directly install the upstream oxygen sensor, precisely matching the original interface and signal parameters. This part monitors oxygen content in exhaust and feedback to ECU to adjust air-fuel ratio, ensuring engine combustion efficiency and emissions compliance. OEM number is 12575904, also compatible with 0258007200 for cross-checking with inventory or orders. Replacement difficulty: medium. Use a dedicated socket to remove to avoid thread damage. After replacement, clear fault codes and road-test for 10 minutes to complete adaptation. This sensor is of KLP brand, standard specification, suitable as a cost-effective replacement to reduce repair costs.