This is a genuine Mercedes-Benz Engine Control Unit (ECU) for 2001-2006 W220 S500 and S430 4Matic models. The part number A1131532279 is compatible with various years and models, ensuring a direct replacement fitment. Made in Germany, this ECU features pin terminals and is known for its easy installation. With interchange part numbers 0261207709 and 1705451240, this ECU is designed for front placement in the vehicle. This module is crucial for controlling the engine's performance in these specific Mercedes-Benz models. NOTICE: No matter how hard we try, errors can be made. In case of confusion, The Photos RULE. The above descriptions and dimensions are approximate but very close. We have an eclectic assortment of items listed in our store . . . Please click on " Visit Store " or " See other items " at the upper right of this page to browse our offerings. Note: I will be happy to combine orders to attempt to save you money if items have a shipping fee. All items come from a smoke free location. Your item will ship within 1 day after payment is received. 100% customer satisfaction is our goal. Come in and browse our store and? check out other items available! Add us to your favorites folder and check back often for new items! Please understand this is a VINTAGE and/or USED ITEM that MAY show wear from age and use. There MAY BE fading, scuffs, marks, nicks, paint/detail loss, etc. Please review ALL the photos/listing again before purchasing. We've done our best to include as many pictures as possible to show the item's condition. Again, all items are sold AS IS. If an item states: "Sold for parts/Non-Working/As-is", it means just that. SHIPPING: I will only ship to the address that is associated with your account. Unless otherwise stated packages are shipped USPS GROUND. I ship next business day, holidays and weekends excluded, of cleared payment. We pack with care. If you require additional insurance or have questions, please feel free to ask. FEEDBACK: Your feedback is important to us. If your business with us is satisfactory, please leave a positive and we will do the same for you. Should there be any problems with this transaction please contact us and we will do our very best to correct them. Have a wonderful day! Paul and Melanie