For a Toyota Vitz (2008–2012), the upstream oxygen sensor (also called Sensor 1 or the front sensor) is a critical component located in the exhaust manifold before the catalytic converter.
Key Specifications & Part Numbers
Because the Toyota Vitz has different engine variants (e.g., 1.0L 1KR-FE, 1.3L 2SZ-FE/1NR-FE, or 1.5L 1NZ-FE), you must verify the part number against your specific VIN or Engine