Parking assist sensor replace advise

Suggestion / advise on the parking assist sensors: I learned this after Toyota dealer tried to charge $1800 to replace a rear sensor and decided to repair myself. A Toyota OEM sensor is $178 available on line including shipping. You can get a knockoff cheaper with no warranty. The bumper covers can be removed with reasonable care. The key is to unplug the sensor from its connector. That takes a little effort and good light, but do it before removing the cover. With cover removed and sensor still mounted, unlock the sensor tabs and push it through the cover hole to the outside. That way you could replace the cover only if the sensor is good. Install the new sensor by inserting it connector end first through the cover hole while rotating it and align its index key with the slot in the cover hole. Once aligned, gently push it into its locking position. It takes a little effort , but now you can plug the connector to the sensor. Test the system before you fully install the bumper cover. These sensors come with their mounting bushing installed. Do not try to separate them. Doing so will ruin the sensor.