The NX 450h+ is Lexus's first plug-in hybrid SUV, sharing its TNGA-K platform and 2.5-litre A25A-FXS engine with the Toyota RAV4 Prime. Combined output is 309 hp through an eCVT with electric all-wheel drive. The 18.1 kWh battery delivers around 60-70 km of electric range (WLTP), and the hybrid system draws on Toyota's decades of hybrid engineering. Build quality and software stability improved noticeably from the 2023 model year onward.· more· less
Proven Toyota hybrid powertrainLexus Relax warranty up to 10 years
12V battery drains faster than rivalsInfotainment system prone to crashes
Buy if: You want a premium PHEV SUV with low running costs and Toyota/Lexus reliability, and can confirm all recalls have been completed.
Avoid if: You frequently leave the car parked for over a week without driving or cannot plug in regularly to keep the PHEV system healthy.
Price & maintenance
Used price
€49,400
median asking price, typically 35,000 km
Typical range€46,000 – €52,000
Kilometres drivenAll
Maintenance cost
€750 – €1,350/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€550 – €900 /yr
Risk bufferunplanned repairs€200 – €450 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Used price
€49,400
Typically €46,000 – €52,000, at around 35,000 km.
Kilometres driven
Maintenance
€750 – €1,350per year
€550 – €900
service, tyres, brakes
€200 – €450
repair buffer
Price & maintenance
Used price
€48,000
median asking price, typically 40,000 km
Typical range€45,000 – €52,700
Kilometres drivenAll
Maintenance cost
€750 – €1,350/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€550 – €900 /yr
Risk bufferunplanned repairs€200 – €450 /yr
Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
DC-DC converter management leaves the 12V battery undercharged, causing dead battery and electrical faults · more· less
This is a well-documented issue across the NX 450h+ and related Toyota PHEVs. The DC-DC converter (which replaces a traditional alternator) sometimes fails to charge the 12V battery sufficiently while driving, particularly during short trips or when the car runs mostly in EV mode. Owners report the car going completely dead after 7-10 days of being parked. The root cause is the DC-DC converter being turned off for extended periods while the car is in drive mode. Symptoms include random electrical faults, door handles not responding, and inability to start. A quality AGM replacement battery costs €150-250, and some owners add a trickle charger (CTEK recommended) for extended parking periods. Lexus has issued software updates for the charging logic, but the underlying issue persists for many owners.
Infotainment system freezing and rebooting
up to €8002 of 6
Touchscreen becomes unresponsive or reboots mid-journey, sometimes requiring head unit replacement · more· less
The new-generation Lexus multimedia system introduced with the AZ20 NX has been widely reported to freeze, crash, and reboot during driving. When it crashes, the entire system can become unusable for the remainder of the journey, including navigation, climate controls, and the reversing camera display. Lexus has released several over-the-air software updates, which resolved the issue for some owners but not all. In persistent cases, the entire head unit may need replacement under warranty (€500-800 if out of warranty). The problem is most common on 2022 models and has improved with subsequent software versions.
Electronic door handle malfunction
up to €6003 of 6
E-latch door handles fail to open, especially in cold or wet weather · more· less
The NX AZ20 uses electronic door handles (e-latch) that can fail to open, particularly in cold weather when water enters the handle mechanism and freezes. Lexus issued a Limited Service Campaign in some markets to replace affected exterior door handle assemblies. Symptoms include the button clicking but the door not unlatching, or a door lock malfunction warning on the dashboard. A mechanical backup exists (pulling the interior handle twice). Replacement of a single door handle assembly costs €200-300 at a dealer. The issue is most pronounced in regions with frequent freeze-thaw cycles.
EGR cooler degradation
up to €1,2004 of 6
Chlorine contamination corrodes the EGR cooler, allowing coolant into the intake · more· less
The A25A-FXS engine shares a known EGR cooler vulnerability with other Toyota Dynamic Force engines. Traces of chlorine in the coolant or production residue gradually corrode the cooler internally, allowing coolant to enter the intake manifold and combustion chambers. Symptoms include a sweet coolant smell, dropping coolant level without visible external leaks, and white exhaust smoke. Toyota has issued a Technical Service Bulletin for EGR cooler replacement. The issue typically appears after 80,000-120,000 km. Because the NX 450h+ runs in EV mode for much of its urban driving, engine operating hours accumulate more slowly than on a conventional hybrid, potentially delaying onset. Repair cost is €500-1,200 at a specialist.
Plug-in charging system malfunction
up to €1,5005 of 6
Check engine light with charging system warning, sometimes resolved by software update · more· less
Some owners report a check engine light accompanied by a 'Plug-in Charging System Malfunction' message. The issue can be intermittent, disappearing and returning over weeks. In some cases, a dealer software update resolves the problem. In others, the onboard charger module may need replacement, which costs approximately €1,000-1,500 out of warranty. The 6.6 kW onboard charger is generally reliable, but occasional failures have been reported, particularly on early 2022 models. If the warning appears, the car can still drive normally in hybrid mode.
Lexus Safety Sense+ intermittent loss
up to €3006 of 6
Forward camera software glitch causes safety features to drop out for several seconds · more· less
Special Service Campaign 23LC01 addresses a software bug in the forward recognition camera on 2022-2023 NX models. The Lexus Safety Sense+ features (pre-collision system, lane departure alert, adaptive cruise control) can become inoperative for approximately 4 seconds before rebooting. The fix is a free dealer software update that takes around 30-45 minutes. A separate TSB (25LC02) addresses a rarer issue where the software bug can physically damage the camera, requiring replacement at approximately €200-300.
Reliable for a PHEV, with typical first-generation electronic teething issues
The NX 450h+ benefits from Toyota's proven hybrid engineering, and the A25A-FXS engine is robust. Most reported issues are electronic rather than mechanical: 12V battery management, infotainment software, and door handle electronics. The PHEV-specific DC-DC converter recall affected only 2022 models and has been addressed. For a first-generation plug-in hybrid, the NX 450h+ has fewer reported problems than most German PHEV competitors. Keeping the 12V battery healthy (regular driving or a trickle charger) and confirming all recalls are completed addresses the main ownership concerns.
Service history
Complete Lexus dealer or approved specialist records essential. Verify annual servicing to maintain Lexus Relax extended warranty.
Tires
Check tread depth, age (date codes), and uneven wear on all four 235/50R20 tires. PHEV weight accelerates tire wear.
Cold start
Start the car cold and listen for any unusual ticking or rattling beyond normal direct-injection noise.
Test drive
Drive for at least 20 minutes including both EV mode and hybrid mode. Verify smooth transitions between electric and petrol power.
Specific for this vehicle
Check 12V battery health
Ask about the last 12V battery replacement. Test voltage (should be above 12.4V when off). Ask if the car has been sitting for extended periods.
Test all four electronic door handles
Lock and unlock the car, then test each door handle from outside. Press each button multiple times. Check for any door lock malfunction warnings.
Verify DC-DC converter recall (2022 models)
Contact Lexus with the VIN to confirm recall 23LB01 (DC-DC converter fire risk) has been completed. Applies to April 2021 through May 2022 production.
+ 4 more checksShow less
Test infotainment system thoroughly
Use navigation, radio, and phone connectivity during the test drive. Check for freezing, lag, or unexpected reboots.
Check coolant level and condition
Low coolant without visible leaks can indicate early EGR cooler degradation. Verify Toyota Super Long Life Coolant is used.
Plug in and verify charging
If possible, connect to a charging point and verify the charging system initializes correctly and shows no error messages.
Verify Lexus Safety Sense+ update (23LC01)
Confirm the forward camera software update has been applied on 2022-2023 models. Ask the dealer to check using the VIN.
Recalls and Technical Service Bulletins
DC-DC converter fire risk due to manufacturing damage (2022 models, April 2021 - May 2022 production, recall 23LB01)Critical - verify completed
Vehicle Stability Control software not reactivating after manual disable and restart (2022 models, recall 22LA01)Verify completed
Missing spot-welds at front shock absorber mounting area (2022 models, recall 22LA02)Verify completed
Lexus Safety Sense+ intermittent inoperability due to camera software (2022-2023 models, campaign 23LC01)Verify completed
Contact Lexus with the VIN to verify all recalls and service campaigns have been completed. The DC-DC converter recall is particularly critical for 2022 models due to fire risk. Lexus Europe provides an online recall checker at lexus.eu/forms/recall.
Warranty Status
Factory warranty (3 years / 100,000 km)May still apply on 2023+ models
Lexus Relax extended warrantyUp to 10 years with annual dealer servicing
Hybrid battery warranty8 years / 160,000 km (extendable to 10 years with Lexus Relax)
Rust perforation warranty (12 years)Active on all NX 450h+ models
Lexus Relax provides 12 months additional warranty each time the car is serviced at an approved Lexus centre, up to 10 years or 160,000 km. The hybrid battery warranty covers capacity below 70% due to manufacturing defects. Verify with the dealer whether the Lexus Relax chain has been maintained by the previous owner.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
