Thinking about buying a used Lexus IS250 (2005–2020) in New Zealand? We've documented 6 known faults for this model spanning electrical, engine, and suspension. Each researched and verified before it's published. The most serious issues here are rated major. Every one is listed below with its symptoms and repair cost, and each has its own page with where to look and what to ask the seller. Free, no account needed.
6
Major
$700–$1,900
12
Pick the engine above first: the IS250 came with 5, and without it the report has to show all of their faults. Pick the engine
Can't confirm for this car
Lexus IS250
Nothing has been narrowed yet, so nothing below is a claim about a particular car. Pick a year and an engine to see which faults apply.
Tell us the engine, or check the engine code on the car, before relying on this.
matched on no vehicle context
Cold idle quality and any misfire codes are secondary indicators.
4GR-FSE intake valve carbon buildup
The 4GR-FSE uses D-4 direct injection, which sprays fuel into the combustion chamber rather than the intake port. Without fuel washing the backs of the intake valves, carbon deposits accumulate over time causing rough idle, misfires, hesitation under load, and progressive power loss. Walnut-blasting or chemical induction cleaning is the established remedy. Very prevalent in AU/NZ examples above 80,000 km.
What you would notice
Cold-start the engine after it has sat overnight and listen immediately at the front of the engine.
4GR-FSE timing chain tensioner cold start rattle
The primary timing chain tensioner on the 4GR-FSE relies on oil pressure to maintain tension. On cold starts, the tensioner bleeds down after the engine sits, allowing momentary chain slack until oil pressure is restored. This produces a distinctive metallic rattling from the front of the engine lasting two to ten seconds at startup. Repeated cycles accelerate chain and guide wear. At higher mileage the rattle may persist longer or become audible once oil viscosity degrades.
What you would notice
Visually inspect rear carrier arm bushes for cracking, delamination, or rubber extrusion from the sleeve.
Rear knuckle carrier arm bush wear — alignment wander
The IS-platform rear multi-link suspension uses rubber-bonded bushes at the carrier arm (No. 2 lower arm and toe-control arm) to knuckle attachment points. These bushes are loaded in torsion and compression with every steering, braking, and cornering input and degrade progressively with age and accumulated load cycles. As the bush compliance increases beyond design limits, the rear wheel toe angle is no longer rigidly controlled and shifts under dynamic loads. The resulting rear-end instability manifests as the rear of the car tracking slightly sideways under braking or lane changes, described by drivers as a reluctance to hold a straight line or a vague, unsettled feel at highway speed. Correction requires replacement of the affected trailing or toe-control arms, or professional rebushing, followed by a four-wheel alignment with rear toe adjustment.
What you would notice
Repeat at 3 and 9 o'clock to test wheel bearing.
Front lower arm ball joint premature failure
The XE20 IS 250 front lower control arm ball joints are known to wear ahead of their expected service life, particularly on AU/NZ roads. Worn ball joints produce a characteristic clunking from the front suspension over bumps, potholes, and during braking, and can cause the vehicle to fail a Warrant of Fitness. The ball joints are not serviceable separately from the lower arm on this platform in standard fitment; replacement typically means a new or aftermarket lower control arm assembly. Both sides commonly wear at similar rates so concurrent replacement is advisable.
What you would notice
Visually inspect the rear lower arm bush for cracking, splitting, extrusion of the rubber element, or metal-to-metal contact.
Front lower arm rear bush wear — toe wander
The rear pivot bushing of the front lower wishbone (lower control arm) on the IS-platform uses a hydraulic or high-density rubber compound bush that degrades with age, heat cycling, and accumulated load. As the bush softens and collapses internally, the control arm is free to pivot rearward under braking forces and forward under acceleration, causing the front wheel toe angle to change dynamically rather than remaining fixed. This produces characteristic toe wander — the car pulls to one side under braking, tracks inconsistently at highway speed, and resists holding a stable alignment. The bush is a press-fit item requiring a hydraulic press for removal and installation; a full four-wheel alignment must be performed after replacement.
What you would notice
Note whether the PS warning light has any recorded occurrence in freeze-frame data.
Electric power steering torque sensor failure
The IS250 and IS350 use a column-assist electric power steering system in which a torque sensor in the steering column measures driver steering input and signals the EPS ECU to provide proportional electric assistance. The torque sensor sub-unit is susceptible to internal degradation of the piezoelectric sensing element and to connector corrosion or wiring harness chafing at the firewall pass-through. Failure modes range from intermittent loss of power assist to a persistent directional pull or an off-centre steering wheel in the absence of any wheel alignment fault. The EPS ECU stores specific diagnostic codes for sensor circuit faults. In some cases the fault resets after an ignition cycle, masking the underlying degradation until total assist loss occurs. Repair involves either the torque sensor sub-assembly or the full intermediate steering column depending on parts availability and whether the shaft is integrated.
What you would notice
Major service, including spark plug replacement and a thorough inspection of the drivetrain fluids.
Assess the condition of suspension bushings and check for water pump weepage, standard preventive maintenance for this platform.
Have the transmission fluid checked or replaced if it hasn't been done, as these transmissions prefer clean fluid for longevity.
Major fluid refresh including transmission and differential oils.
Monitor the health of the suspension bushings and struts for any signs of fatigue.
Review the condition of the fuel pump and ignition system components for continued reliability.
Full transmission fluid service and inspection of the AWD transfer case oil to ensure longevity.
The water pump may begin to show signs of seepage; inspect the cooling system components during your routine service.
Suspension dampers and secondary rubber bushings often reach the end of their design life, which may affect ride comfort.
Confirm the spark plugs (iridium) have been swapped out and the coolant system refreshed.
Check the condition of the water pump and serpentine belt tensioner, common wear items that benefit from preventative replacement.
Inspect the suspension dampers and original bushings to maintain that signature Lexus ride comfort.
Can't confirm for this car
The primary timing chain tensioner on the 4GR-FSE relies on oil pressure to maintain tension. On cold starts, the tensioner bleeds down after the engine sits, allowing momentary chain slack until oil pressure is restored. This produces a distinctive metallic rattling from the front of the engine lasting two to ten seconds at startup. Repeated cycles accelerate chain and guide wear. At higher mileage the rattle may persist longer or become audible once oil viscosity degrades.
Example of the part — not this vehicleThe front of a twin-cam engine with the timing cover off — chain, sprockets and guides.
Symptoms to notice
What to check
Ask the seller
Can't confirm for this car
The IS250 and IS350 use a column-assist electric power steering system in which a torque sensor in the steering column measures driver steering input and signals the EPS ECU to provide proportional electric assistance. The torque sensor sub-unit is susceptible to internal degradation of the piezoelectric sensing element and to connector corrosion or wiring harness chafing at the firewall pass-through. Failure modes range from intermittent loss of power assist to a persistent directional pull or an off-centre steering wheel in the absence of any wheel alignment fault. The EPS ECU stores specific diagnostic codes for sensor circuit faults. In some cases the fault resets after an ignition cycle, masking the underlying degradation until total assist loss occurs. Repair involves either the torque sensor sub-assembly or the full intermediate steering column depending on parts availability and whether the shaft is integrated.
Symptoms to notice
What to check
Ask the seller
Can't confirm for this car
The XE20 IS 250 front lower control arm ball joints are known to wear ahead of their expected service life, particularly on AU/NZ roads. Worn ball joints produce a characteristic clunking from the front suspension over bumps, potholes, and during braking, and can cause the vehicle to fail a Warrant of Fitness. The ball joints are not serviceable separately from the lower arm on this platform in standard fitment; replacement typically means a new or aftermarket lower control arm assembly. Both sides commonly wear at similar rates so concurrent replacement is advisable.
Example of the part — not this vehicleA separated lower ball joint: the control arm has dropped and the wheel has splayed out under the guard.
Symptoms to notice
What to check
Ask the seller
Some of the Lexus IS250’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.
Like any used car, it depends on the specific example and its service history. Across the 6 documented faults for the Lexus IS250, the recurring problem areas are electrical, engine, and suspension. A Lexus IS250 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.
We've catalogued 6 known faults for the Lexus IS250, covering electrical, engine, and suspension. All 6 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.
Most single repairs on the Lexus IS250 fall between $700–$1,900 at NZ independent-workshop rates. Some of the 6 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.
Yes. A Lexus IS250 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 $24.90 far less than the cost of missing one of the faults on this page.