2021 Lexus Ls

The LS 500h and LS 500 with the optional Adaptive Variable Suspension (AVS) air ride system can experience air compressor failure or air spring leaks, causing the vehicle to sag on one or more corners. Symptoms include the vehicle sitting low after being parked overnight and a noisy compressor running continuously. Failure rates increase after 60,000 miles.

Diagnose which air spring or the compressor has failed using the Lexus diagnostic system. Replace the failed air spring strut assembly and inspect the compressor for overwork damage. Lexus-specific air suspension components are significantly more expensive than standard parts. Consider a coil-spring conversion kit for a permanent, lower-cost solution.

The 2018 LS introduced a 12.3-inch navigation display controlled by a trackpad, which is widely considered difficult and distracting to operate. The layered menu system has a steep learning curve, and the trackpad requires taking eyes off the road. Apple CarPlay was not available at launch and was added retroactively, but wireless CarPlay requires a specific head unit update.

Update the Lexus multimedia system to the latest firmware version, which includes Apple CarPlay and improved interface responsiveness. The update may be free or require a dealer visit depending on the vehicle's current software version. Utilize voice commands via the steering wheel button to minimize trackpad use while driving.

The electronically controlled brake actuator on the 2018 LS can produce a grinding, clicking, or humming noise at low speeds, particularly during light braking and when the vehicle comes to a complete stop. The noise originates from the brake actuator motor cycling to maintain brake pressure and is audible in the quiet cabin. NHTSA received complaints about this behavior.

Lexus issued a TSB to reprogram the brake actuator control ECU to reduce the cycling noise. The software update adjusts the actuator operation to minimize audible noise. If noise persists after the software update, the brake actuator assembly may need replacement under warranty. The regenerative braking calibration may also be updated.

The Aisin 10-speed automatic transmission in the LS 500 can exhibit gear-hunting behavior during light-to-moderate throttle applications, frequently shifting between adjacent gears and never settling on the optimal ratio. This creates a busy, unsettled driving feel that is at odds with the LS's luxury character. The issue is most apparent on rolling terrain.

Lexus has released transmission control module software updates to refine the shift logic and reduce gear hunting. Visit the dealer for the latest TCM calibration. Switching to Sport mode provides more decisive shift behavior. A transmission fluid service with Toyota WS-ATF may also improve shift quality.

Owners report that rear seat entry and exit is more difficult than expected in the 2018 LS due to the coupe-like roofline and relatively narrow rear door openings. Taller passengers must duck significantly to enter, and the high door sills require a high step-over. The power rear door courtesy feature is also reported to be slow in operation.

There is no modification to address the structural dimensions of the rear door openings. Lowering the air suspension to its lowest setting before passengers enter provides a slightly easier entry angle. The power easy-access rear seat adjustment can be activated to move the front seat forward when the rear door is opened.