Thinking about buying a used Lexus UX (2018–2024) in New Zealand? We've documented 19 known faults for this model spanning electrical, transmission, engine, and brakes. Each researched and verified before it's published. The most serious issues here are rated major. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
19
Documented faults
Major
Most serious
$600–$3,000
Typical repair
7
Systems covered
Known Lexus UX faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
The UX250h uses a lithium-ion traction battery pack paired with the A25A-FXS 2.5-litre hybrid drivetrain. Documented owner reports and NHTSA complaints describe measurable capacity loss in higher-mileage examples (typically above 100,000 km), reducing EV-only running distance, lowering fuel economy, and causing the hybrid system to engage the petrol engine more frequently at low speeds. Battery Management System recalibration can temporarily mask the issue. Full traction battery replacement is required once cells degrade below Toyota's threshold.
Symptoms to notice
Noticeably reduced fuel economy compared to rated figures even on mixed driving
Petrol engine starts immediately at low urban speeds where a healthy pack would run on EV only
Hybrid battery charge indicator fluctuates rapidly or rarely reaches full charge
Hybrid system warning (red triangle) on instrument cluster
Techstream or compatible), read traction battery State of Health (SOH) percentage and individual cell voltage spread. SOH below 70% or a cell voltage spread exceeding 0.3V indicates significant degradation. Note whether the petrol engine starts at very low speeds in stop-start traffic, which should not occur on a healthy battery. Check for hybrid system warning lights or 'red triangle' warnings in service history. If a workshop inspection is possible: On a hybrid-capable OBD scan tool (e.g.
Where to look: Under rear seat/cargo floor — traction battery pack
Ask the seller
“Has the hybrid battery ever triggered a warning light or been flagged in a dealer inspection?”
“What is the current fuel economy in mixed driving and how does it compare to the original rated figure?”
“Has a Techstream or equivalent hybrid diagnostic been run recently showing battery state of health?”
02M20A-FKS Excessive Oil Consumption via Piston Ring Blow-By
MinorOccasionalEngine $150–$5,500 to fix
A subset of UX200 vehicles with the M20A-FKS direct-injection 2.0-litre engine have documented consumption of engine oil at a rate exceeding 1 litre per 3,000-5,000 km, attributed to piston ring wear patterns associated with the engine's short oil change intervals not being observed. The direct injection combustion process produces higher carbon and particulate loading on the rings compared to port injection engines. Owner-reported cases describe needing to add oil between services, with some NHTSA complaints noting consumption rates Lexus considers within specification but which owners find unacceptable. Severe cases cause blue smoke on start or under load.
Symptoms to notice
Engine oil level dropping noticeably between scheduled service intervals
Blue or grey smoke from the exhaust on cold start or when accelerating hard
Burning oil smell from the engine bay during or after driving
Oil level warning lamp illuminating before the next service is due
Carbon deposits visible around the tail pipe outlet
What to check
Check the engine oil dipstick — if it is significantly below the full mark before the next scheduled service, oil consumption is occurring. Inspect the tailpipe for blue-tinged smoke on a cold start or under hard acceleration. Check the PCV system and oil filler cap interior for creamy or sludgy deposits indicating blow-by gases condensing. Request service records to determine how frequently oil has been topped up between changes.
Where to look: Engine internal — piston rings, cylinder bore; PCV system on top of engine
Ask the seller
“How frequently do you need to top up the engine oil between scheduled services?”
“Have you ever noticed blue smoke from the exhaust on start-up or under acceleration?”
“Has a dealer acknowledged any oil consumption concern or run a consumption test?”
TransmissionMajor
ElectricalMajor
ElectricalMajor
EngineMajor
BrakesMajor
SuspensionMajor
CoolingMajor
EngineMajor
ElectricalMajor
ElectricalMinor
TransmissionMinor
ElectricalMinor
BrakesMinor
BrakesMinor
ElectricalMinor
ElectricalMinor
InteriorCosmetic
17 more documented faults on the Lexus UX
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 19 documented faults for the Lexus UX, the recurring problem areas are electrical, transmission, and engine. A Lexus UX with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Lexus UX?
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We've catalogued 19 known faults for the Lexus UX, covering electrical, transmission, and engine. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Lexus UX?
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Most single repairs on the Lexus UX fall between $600–$3,000 at NZ independent-workshop rates. Some of the 19 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Lexus UX?
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Yes. A Lexus UX inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.