Enhance your vehicle’s performance and fuel efficiency with this high-quality, pretested Oxygen Sensor, designed to provide precise and reliable measurements of oxygen levels in exhaust gases. Engineered to help your engine maintain the perfect air-fuel ratio, this oxygen sensor improves fuel economy while reducing harmful emissions, ensuring your engine runs smoothly and efficiently. Key Features: · Pretested and High Precision: Each oxygen sensor undergoes rigorous testing to guarantee accurate performance and long-lasting reliability. · Improved Fuel Efficiency: Optimizes the air-gas mixture for better combustion, resulting in enhanced fuel economy and reduced emissions. · Enhanced Engine Performance: Helps improve engine response and overall vehicle performance by maintaining optimal oxygen levels. · Direct Replacement: Easy to install, designed as a direct fit replacement for the original sensor, simplifying maintenance and repairs. · Durable Construction: Made from high-quality metal and plastic materials to withstand harsh automotive environments and provide extended service life. · Wide Vehicle Compatibility: Specifically designed to fit various models, including 323i, 325i, X3, X5, E39, and E46 series, with support for upstream and downstream installation. Specifications: · Condition: 100% Brand New · Material: Metal + Plastic · Package Weight: Approx. 564g (20oz) · Reference Part Numbers: 1781433050, 11781433075, 11781433940, 11781742050, 234-4672, 234-4683, SG1108, ES10899, ES10857, 15109, 13477, 250-24611, 250-24392, 0258005109, 025800347 · Size: As shown in product images Fitment: Compatible with multiple engine models and years including but not limited to: · 323Ci (2000 E46 M52 L6-2.5L) Upstream and Downstream · 323i (1999-2000 E46 M52 L6-2.5L) Upstream and Downstream · 325Ci, 325i, 325Xi (2001-2005 E46 M54 L6-2.5L) Upstream and Downstream · 328Ci, 328i (1999-2000 E46 M52 L6-2.8L) Upstream and Downstream · 330Ci, 330i, 330Xi (2001-2005 E46 M54 L6-3.0L) Upstream and Downstream · 525i (2001-2003 E39 M54 L6-2.5L) Upstream and Downstream · 528i (1999-2000 E39 M52 L6-2.8L) Upstream and Downstream · 530i (2001-2003 E39 M54 L6-3.0L) Upstream and Downstream · X3 (2004-2006 E83 M54 L6-2.5L/3.0L) Manual Transmission Upstream and Downstream · X5 (2001-2006 E53 M54 L6-3.0L) Upstream and Downstream · Z3 (1999-2002 E36 M52/M54 L6-2.8L/3.0L) Upstream and Downstream · Z4 (2003-2005 E85 M54 L6-2.5L/3.0L) Upstream and Downstream Package Includes: · 4 x Oxygen Sensor This oxygen sensor is an essential component for maintaining your vehicle’s engine efficiency, emissions control, and overall performance. Its precise functionality and easy installation make it an ideal upgrade or replacement part for various compatible models, helping you achieve optimal fuel economy and cleaner exhaust output.