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2018–2025 Lexus RX 450h FAQ
What should I do if my RX 450h transmission fluid needs replacement?
2025
If replacement is necessary, contact a Lexus dealer and use Toyota Genuine ATF WS; another fluid may cause noise, vibration, or transmission damage.
Page 614 in the 2025 manual →2020–2022
Contact a Lexus dealer for replacement; the 5.1 qt. capacity is only a reference, and the specified fluid is Toyota Genuine ATF WS.
Using another transmission fluid may cause abnormal noise or vibration, or ultimately damage the transmission.
Page 459 in the 2022 manual →2018–2019
If replacement is necessary, contact your Lexus dealer and use Toyota Genuine ATF WS; another fluid may ultimately damage the hybrid transmission.
Page 716 in the 2019 manual →Can I use Remote control function after starting the hybrid system with remote start?
2025
Remote control function may not operate properly if the hybrid system was started using remote start.
Page 399 in the 2025 manual →When is maintenance due for my Lexus RX 450h?
2025
Perform general maintenance daily, and complete scheduled maintenance at the specified intervals in the maintenance schedule.
Page 498 in the 2025 manual →2020–2022
Lexus recommends cleaning the vehicle interior at least twice a year to maintain its quality.
Page 357 in the 2022 manual →2018–2019
Perform general maintenance daily, and complete scheduled maintenance at the specified intervals in the maintenance schedule.
Page 587 in the 2019 manual →What does the driving-range estimate mean?
2025
The driving-range estimate shows distance remaining with the fuel, based on average fuel consumption, so actual distance may differ.
Page 140 in the 2025 manual →Why does the EV driving range change?
2025
The EV driving range changes when air conditioning operates and may shorten while parked because the system consumes power.
Page 142 in the 2025 manual →What should I do if air flow from the vents decreases dramatically?
2025
Check the filter for clogging and replace it if necessary, and always keep a filter installed to prevent system damage.
Page 535 in the 2025 manual →2020–2022
Always keep a filter installed, because using the air conditioning system without one may damage the system.
Page 386 in the 2022 manual →2018–2019
- If vent airflow decreases dramatically, check the filter because it may be clogged, and replace it if necessary.
- If an air-conditioning odor continues, replace the filter; fragrances can significantly weaken its deodorizing effect in a short time.
Can I push-start the RX 450h if its 12-volt battery is discharged?
What should I do if the electronic key battery is depleted?
2020–2022
Use the mechanical key, then store it in the electronic key and carry both together for access if the electronic key battery is depleted.
Page 110 in the 2022 manual →What should I know before replacing my RX 450h spark plugs?
2018–2019
Use DENSO FK20HBR8 iridium-tipped spark plugs only, and do not adjust the spark plug gap.
Page 715 in the 2019 manual →What should I do if an exterior LED light burns out?
2018–2019
The listed exterior lights use multiple LEDs; if any LED burns out, take the vehicle to your Lexus dealer for replacement.
Page 649 in the 2019 manual →Lexus RX 450h complaints to NHTSA
Complaints that owners filed with NHTSA for each model year. They are unverified reports and are not adjusted for how many vehicles were sold.
| Year | Complaints | Crashes / fires / injuries | Most reported areas |
|---|---|---|---|
| 2025 | 0 | 0 / 0 / 0 | None reported |
| 2022 | 39 | 6 / 2 / 5 | Unknown or other (12), Electrical system (8), Fuel/propulsion system (5) |
| 2021 | 70 | 9 / 0 / 9 | Air bags (47), Unknown or other (7), Electrical system (4) |
| 2020 | 48 | 7 / 0 / 4 | Air bags (21), Unknown or other (9), Engine (5) |
| 2019 | 37 | 10 / 0 / 2 | Forward collision avoidance (11), Fuel/propulsion system (11), Service brakes (10) |
| 2018 | 29 | 3 / 0 / 2 | Service brakes (7), Unknown or other (6), Engine (5) |
| 2016 | 35 | 3 / 0 / 1 | Structure (8), Service brakes (7), Engine (6) |
| 2015 | 25 | 2 / 1 / 1 | Engine (7), Unknown or other (6), Electrical system (4) |
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All Lexus RX 450h manuals
| Year | Generation | Pages | File |
|---|---|---|---|
| 2025 | 2025 | 688 pages | 13.9 MB |
| 2022 | 2020–2022 | 532 pages | 15.6 MB |
| 2021 | 2020–2022 | 528 pages | 11.3 MB |
| 2020 | 2020–2022 | 528 pages | 18.5 MB |
| 2019 | 2018–2019 | 792 pages | 13.4 MB |
| 2018 | 2018–2019 | 792 pages | 13.1 MB |
| 2016 | 2016 | 660 pages | 10.6 MB |
| 2015 | 2015 | 878 pages | 12.2 MB |
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