The IWOKPHD Oxygen Sensor Upstream is the precise, ready-to-install replacement you need for BMW X3 models and a wide range of BMW variants. As an upstream oxygen sensor, it sits before the catalytic converter to monitor exhaust gas composition and send real-time feedback to the engine control unit. This enables optimal air-fuel balance, better fuel efficiency, smoother idle, and reduced emissionshelping your BMW run cleaner and more responsively. Built to match OEM specifications, this sensor supports quick warm-up and reliable performance even in challenging exhaust conditions.

Designed with a heated type and magnetic induction sensing, this upstream sensor delivers fast, accurate readings and robust durability. It carries OEM numbers such as 11788631047 and ES#3213360, ensuring compatibility across multiple BMW models and engine configurations. Brand assurance comes from IWOKPHD, with parts manufactured to meet or exceed original performance