Problems · NHTSA complaints
2019 Lexus NX300H problems
Owners filed 8 complaints about the 2019 Lexus NX300H with NHTSA between Jun 2025 and Aug 2026. The most-cited component is engine and engine cooling (2).
Complaints
8
Filed with NHTSA
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Engine and engine cooling2
- Fuel/propulsion system2
- Back over prevention2
- Forward collision avoidance2
- Lane departure1
- Fuel system, gasoline1
- Steering1
- Power train1
- Other / unknown1
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
4
4
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2025 | 4 |
| 2026 | 4 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Engine and engine cooling
2 reports
“The contact owns a 2019 Lexus NX-300H. The contact stated that while driving uphill at an undisclosed speed, the vehicle stalled. The failure was a recurring failure. The dealer was contacted, and the vehicle was diagnosed. The contact was informed that there was coolant leaking into the engine block and that the engine needed to be replaced. The contact associated the failure with NHTSA Campaign Number: 20V064000 (Engine and Engine Cooling); however, the VIN was not included. The manufacturer was not made aware of the failure. The failure mileage was 103,755.”
Fuel/propulsion system
2 reports
“While the car was idled at a stop light, the warning "reduce engine powere appeared". I took the car to the vehicle and learned this was linked to code P125d71 for fuel pump valve control- a known recall”
Back over prevention
2 reports
“In heavy rain situations I get an error message stating all front active safety systems (forward collision warning, etc.) do not work. The error states to clean or clear the front sensors of the vehicle. There is nothing blocking the sensors but in heavy weather these situations become much more important. Lexus states this is normal when heavy water situations come into play. I understand for going through flood waters but I don't believe it should be in heavy rain. I feel this is a major safety hazard that should come with warnings.”
Forward collision avoidance
2 reports
“During heavy wind driven rain the front sensors start to show errors on the screen. These errors cause the the advance safety systems and parking sensors to deactivate. The warnings state to clean the sensors. Sometimes stopping the vehicle and turning off and on the ignition seems to resent but it does happen again. Usually this takes about 30 minutes of heavy rain to cause the. All other functions of the vehicle work but most safety systems appear to deactivate because of the sensors. This should not happen during a time when the systems are most needed.”
Lane departure
1 report
Fuel system, gasoline
1 report
“The contact owns a 2019 Lexus NX 300. The contact stated that while stopped at a red light, the RPM started to fluctuate. There was no warning light illuminated. The vehicle was taken to an independent mechanic to be diagnosed, and the mechanic retrieved DTC: P0300 and P11EF. Additionally, the check engine warning light was illuminated. The vehicle was then taken to a local dealer to be diagnosed, and the contact was informed that the fuel injector was faulty and needed to be replaced. The vehicle was not repaired. The contact referenced NHTSA Campaign Number: 25V028000 (FUEL SYSTEM, GASOLINE) as a possible cause for the failure. The manufacturer was notified of the failure. The approximate failure mileage was 144,000.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.