After item received and go to Open-A-Return. We, too, wonder that one. By the way, please forgive us refusing any return request in which the order is 31 days old or even older. Customer Service got fired if they don't work things out with you, so knock their door at will. We will respond in 24 hour.
There shall be nothing to worry about as we have confidence to solve your issue. For a presumably defective product received, this one would be a bit tricky. Please tell us where the problem occurs, and our Customer Service and Technical Department will work it through with you. Pictures and videos can come in handy here. We wish you understand the pressures here, and our effort will always come to your aid.
The item "NOx Sensor Nitrogen Oxide Sensor 539-0117 For CAT Caterpillar" is in sale since Sunday, December 30, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Emission Systems\Other Emission Systems". The seller is "kava-autoparts" and is located in GuangZhou. This item can be shipped worldwide.