Hi Jayden, This item can fit either upstream or downstream, depending on the vehicle application. To check the fitment please use our Vehicle Selector — which can be found towards the top of the homepage as well as all categories, search results, and product pages — can help verify if a part will fit your specific application. To enter your application, simply select your vehicle’s year, make, model, sub-model, and engine type and click “Go.” Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.

Hi McMillan, thank you for reaching out. If your 2005 BMW X5 has a 3.0-liter engine, then yes. You can use this link to go back to the item page and continue ordering the part at 58% off the regular price today: https://www.carparts.com/oxygen-sensor/drivewire/set-repb960911-2?can=CPAP3648_CSQA_20220801 I hope this helps. Happy shopping.

No idea for I have the X3

Hi William, thank you for reaching out! Yes, there are 2 sensors in this set. You can click the link, below to order the set while stocks on sale last. Have a good one! https://www.carparts.com/oxygen-sensor/drivewire/set-repb960911-2?can=cpab2020_csqa_20240320

Hi Ismael, Thank you for reaching out to us regarding the order that you have not received. I tried to find your order in our system using your name and email address,but I cannot see any record. For us to track the shipment, please provide us your order number. We also sent you an email to further assist you with your concern. Please respond at your earliest convenience. Thank you.