ALP errors, what's wrong with my device?

[RedRocket]

***Important - where was your car parked in your OP (#1 Post, above) ??? - Was it in the driveway next to that chain link fence I see in Post #7 ?
Well the Sensors are mounted ok. - Did you change the Parking detector range to 3 & see if that stopped the constant Alert ?
Being parked next to that fence so close on one side could very well be your problem. The sensors could be getting reflections from the fence about 10-15ft away caused by IR beam divergence. The Priority is a very sensitive receiver circuit.

Move your car so there is nothing within 180 degrees of the Front/Sides of the car for 50ft+, & then turn on the AL-P & see what happens.