So I purchased a 2022 RX350 in January of 2022 new. There has been a noise coming from the trunk area that has been driving us insane. Through a lot of investigation, I think I have it narrowed down to the piece of styrofoam inside the rear number cover. I had my wife sit inside the car while I moved it from under the car and she confirms that this is the culprit. My question is, will warranty cover these types of things. This is supposed to be a luxury car, but rattles and noises are so annoying.

 

I think it is the trunk cover that is making the noise. I got the same problem.

 

Did you mean the rear "bumper" cover (bumper fascia)? The warranty should cover it but they can always use the excuse "normal wear and tear" in which case you might be out of luck. I would first check to see if there is a Technical Service Bulletin covering this condition, then go to the dealer and talk to the service department.

 

Rattles and other noises are covered for 4 years or 50k miles, whichever comes first, based on date of first use. Since you have a 2022, your still under factory warranty. Schedule an appointment with your dealer, make sure you can reproduce the sound and they should take care of that for you without issue. My 2021 had a creaking sound around my center console and I took it in and they sorted it out, no questions asked. My NX had some mysterious rattle coming from the back hatch, and my dealer figured out it was thier own metal license plate frame and they added foam to it so it wouldn't make any noise. In general, at least for me, I have found my dealer has been more than willing to figure it out. It really helps if you have a recording or a way to "produce it on demand". In both of my cases, I did. Good luck, that would also drive me crazy.

 

I had the same issue in an older RX350 4th gen. Yes that was the issue, but a little worse. The aluminum bumper in behind the fascia and behind the Styrofoam was missing two bolts. I was working at the dealer at the time and the mechanic came and got me to show where the noise was coming from. Once Lexus gets into the bumper the fix is easy. Just wondering how two bolts could just not be installed?

Good luck on the fix.

 

Yes, rear bumper cover. My phone must have autocorrected. There seems to be styrofoam inside there that is rubbing during normal movement while driving.