2018 NISSAN ALTIMA Forward Collision Avoidance Automatic Emergency Braking Problems

i can be driving down the road and pass a guard rail or some other thing on the side of the road but usually a guard rail near my house and it knocks out the emergency braking system. sometimes, it may work my whole trip, other days, i may only go a mile or two before it goes out.

2018 Nissan Altima 24,864 miles. Forward Emergency Braking (FEB) system keeps turning on and off. Contacted dealership and they said it was a dirty bumper/sensor, clean sensor location and continue to use vehicle. If issue persisted set up appointment with dealership to have looked at. Cleaned front bumper and continued to operate. FEB lamp continued to indicate error and turn itself on and off. Set up appointment of have vehicle inspected. Dealership confirmed that sensor was bad and needed to be replaced. The FEB sensor was not covered as warranty expired 18 days before dealership diagnosed problem. Informed them that contacted the dealership prior to the warranty expiration and was told it was a dirty bumper and sensor. Contacted previous owner of vehicle and confirmed that they had reported issue and dealership and informed them to just clean bumper and sensor location. Nissan did not see the FEB sensor error...

JUST PURCHASED USED FROM NISSAN AND WARNING FOR AFB FAILURE KEEPS COMING ON. AFTER A QUICK INTERNET SEARCH I AM CONCERNED ABOUT SAFETY.

I WILL SEE A WARNING NOTICE IN MY DASHBOARD WHILE I'M DRIVING ON CITY STREETS AND SOMETIMES ON THE HIGHWAY, DURING CLEAR WEATHER AND RAINY WEATHER THAT SAYS 'FRONT END COLLISION UNDETECTABLE' AND MY REAR COLLISION CAMERA WILL SOMETIME EITHER HAVE VERTICAL LINES OR GO COMPLETELY OUT. THIS WAS SUPPOSED TO HAVE BEEN FIXED BY MUSICCITY AUTOPLEX IN NASHVILLE, TN IN LATE OCTOBER OF 2019.

EVERY TIME I AM DRIVING, THE AUTOMATIC EMERGENCY BRAKING LIGHT ILLUMINATES AT AROUND 55MPH AND IT STAYS LIT CONSTANTLY. THE SYSTEM AUTOMATICALLY BRAKES WHEN NOTHING IS IN FRONT OF MY VEHICLE ALMOST CAUSING THE PERSON BEHIND ME TO HIT ME. THE CRUISE CONTROL WILL NOT ALLOW ME TO SET IT AFTER TURNING IT ON EITHER.