Fits Si Elec Code: B52C; Heated Oxygen Sensor; Bank 1 Sensor 1; 4-Way Female; w/ Leadsor Si Elec Code: B52D; Heated Oxygen Sensor; Bank 1 Sensor 2; 4-Way Female; w/ Leadsor Si Elec Code: B52F; Heated Oxygen Sensor; Bank 2 Sensor 2; 4-Way Female; w/ Leads