2014 Infiniti QX80 parking sensor replacement

I was getting sonar off when turning my car on and the sonar was not working when getting close to objects. I took it to a Infiniti dealership and they wanted to replace the front wiring harness and four cents. Very expensive. I bought for sensors off Amazon and I did to work myself. SecosAutoparts 4 x Front/Rear Bumper Parking Sensor Compatible with Infiniti Q50 Q60 QX60 QX50 QX70 QX80