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I am reporting a recurring front bumper cracking and separation issue on my Lexus IS 500.  A crack developed at the front bumper seam directly adjacent to the passenger-side headlight assembly. The crack originates at the bumper mounting/retention area near the headlamp and appears to be stress-related rather than impact-related.  There is a known Lexus Technical Service Bulletin addressing front bumper sag and improper retention on this model. Multiple other Lexus IS 500 owners have reported similar cracking and separation in the exact same location, including vehicles that have not been modified or involved in collisions.  My concern is that:  The crack appears at a structural mounting point of the bumper.  Continued stress or separation may compromise bumper retention.  Progressive separation could create risk of partial bumper detachment at highway speeds.  The issue occurs adjacent to the headlight assembly, raising potential concern for lighting alignment or mounting stability if the condition worsens.  This does not appear to be isolated cosmetic damage but rather a recurring stress point at the bumper mounting seam. If the bumper retention system is insufficient or prone to stress cracking, this could pose a potential roadway hazard if separation increases while driving.  Given that Lexus has issued a Technical Service Bulletin regarding bumper sag/retention on this model, I am requesting that NHTSA review whether the front bumper attachment design presents a broader safety concern.

LEXUS IS 2023 STRUCTURE:BODY

The contact owns a 2023 Lexus IS350. The contact stated that while driving at an undisclosed speed, the moon roof suddenly shattered, raining glass into the interior of the vehicle. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 11,000.

LEXUS IS 2023 VISIBILITY:SUN/MOON ROOF ASSEMBLY

During driving an issue arose where the acceleration had to be performed in order to avoid a potential accident.  The gas pedal vas depressed but the transmission would not downshift or accelerate.  After about a second or more the transmission finally downshifted and the vehicle accelerated.   I was able to steer out of trouble and fought the in order to do it.  This is a know issue and programmed by Lexus.  Who in their right mind does not allow the car to accelerate when the gas pedal is depressed.  this issue ue seems to be with IS500 only.  the mechanic did acknowledge a slow shift and this is by design.  I am afraid to pull into traffic since the car will not go. It will start to go then slow down or back off and then after it downshifts it picks up speed.  The time is so slow that I could get hit if the approaching traffic gets to me despite knowing that the distance is sufficient to safely pull into traffic.  the car is unpredictable.  In my other cars I have no issues like this.  I have another Lexus vehicle and it does not do this.   Many have reported the slow downshift and Lexus mechanic say it is by design.  A downshift of one second or more at 60 miles an hour is 88 feet of travel.  The car is not safe to drive because the driver is not in control.  If you have to accelerate to avoid an accident or get out of the way you will not be able until the stupid car decides to.  I have driven other Lexus models and they do not do this.  Only IS500 does this.  It is so unnatural that you press the gas pedal half way down and nothing.  The car has to accelerate when you need to accelerate.  Lexus also sells performance but it is not a performance car.  Somebody is going to die due to this issue.  I am nervous driving the car and I feel like I am out of control.  This is a continuous problem.  So far I almost got into 3 accidents due to this issue that could have resulted in a serious accidents.

LEXUS IS 2023 POWER TRAIN

2023 Lexus IS 300 — vehicle data sourced from FuelEconomy.gov.

El Lexus IS 300 (2023) es un sedán compacto certificado en seguridad, que ofrece una combinación de rendimiento y eficiencia. Con un motor turboalimentado de 2.4 litros y tracción trasera, este vehículo está diseñado para una conducción dinámica.

	2001	2002	2003	2004	2005	2018	2023
Precio	—	—	—	—	—	—	$44,850
Cilindrada	3 litre2997 cc(182.888 cu in)	3 litre2997 cc(182.888 cu in)	3 litre2997 cc(182.888 cu in)	3 litre2997 cc(182.888 cu in)	3 litre2997 cc(182.888 cu in)	2L	2.4 L
Tipo combustible	Gasolina	Gasolina	Gasolina	Gasolina	Gasolina	Gasolina premium	Premium Gasoline
Transmisión	automático 5 velocidades	manual 5 velocidades	manual 5 velocidades	manual 5 velocidades	manual 5 velocidades	Automático (S8)	8 speed automatic
Tipo de carrocería	Sedán de 4/5 plazas	Sedán de 4/5 plazas	Sedán de 4/5 plazas	Sedán de 4/5 plazas	Sedán de 4/5 plazas	Coches compactos	Sedan

Lexus IS 300 (2023) Especificaciones