I bought from eBay as OEM DENSO. The seller offered to replace them stating that the warehouse may have accidentally sent defective parts. I said I lost confidence in his product and I want a refund.The seller refunded me and told me to not send back the parts. I now doubt they are originalnal DENSO sensors because of the poor crimping. I probably can re crimp them and place a little solder to keep them from coming lose again, but I was doing this as preventative maintenance, and I don't want o replace a known good part with a sketchy one.