On Jan 11, 2023 my infiniti qx60 hybrid AWD that I purchased with Premium and Technology packages that includes forward Collison warning (FCW) and intelligent braking system (IBS) failed to work. I got no warning and/or my emergency brake was applied by these systems that I paid high dollars for. I had to apply the hard braking myself to try stop my car from collision but it was too late and ended up rear ending someone in multi car chain accident. I am extremely concern that the Infiniti QX60 FCW and IBS are just sales gimmick and does not work all or not at the right time when you need them. The weather was cloudy but no rain or anything that could have blocked the car sonar and radar. However none of these systems worked. Prior to the accident I have noticed that occasionally I get IBA switched off obstruction warning with nothing in front of the car. The same issues have been noticed on the infiniti's sister brand Nissan's Pathfinder, Rogue and others. Thankfully no one got hurt in my wreck. But I lost my car. I bought all these expensive systems to protect me and my family for these situations. However infiniti systems failed to work on mine. Not sure what options I have to pursue as there are others who have the same issues that I noticed. Hope no one lose their lives before Infiniti and/or nissan can fix this problem. I would also like to know what my options are against a car manufacturer that sold systems that does not work, while the average public buy these expens