Help rear and front park sensor/ not working

[Asahdev17]

My parking sensors just went out. But when I start up the truck the front one will work normally for 2 seconds then say service if I’m near something they will beep but they will say service after 2 seconds. Same with rear sensors. What do I change? The full harness? The sensors? Or both??? Would be great if someone can help me on this please

 

[jljbtm]

Im having a similar problem with my rear sensors and sometimes the front and the message on the dash says to wipe them clean (but they already are clean)?