The 2023 RX 350 represents a major platform shift to the new TNGA-K architecture with the T24A-FTS 2.4L turbo four replacing the reliable V6. Being brand new, long-term reliability data is limited, but early patterns show turbo/cooling concerns and the 8-speed automatic's learning curve issues typical of first-model-year vehicles.
T24A-FTS Turbo Engine Oil Consumption & Carbon Buildup
Occasional · medium severityTypical onset: 30,000-60,000 mi
Symptoms: Low oil warning between changes, Reduced power under boost, Cold-start rough idle, Check engine light with P0011/P0014 cam correlation codes
Fix: Direct injection engines are prone to intake valve carbon. Walnut blasting intake valves takes 4-5 hours; if oil consumption is excessive (>1qt/1000mi), may need piston ring inspection or updates under warranty. Some early units seeing TSB for PCV valve updates.
Estimated cost: $800-1,500
8-Speed Automatic Transmission Harsh Shifts & Shudder
Common · low severityTypical onset: 5,000-40,000 mi
Symptoms: Hard 2-3 or 3-4 upshifts when cold, Low-speed shudder around 25-35 mph, Delayed downshift response, Occasional clunk into reverse
Fix: Early production units show adaptive learning issues with the 8AT. Most resolve with TCM software updates (1 hour) and fresh fluid flush at 30k miles. Persistent cases may need transmission oil cooler replacement (3-4 hours) or torque converter updates under warranty.
Estimated cost: $200-600
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 20,000-50,000 mi
Symptoms: ATF puddle under front of vehicle, Low transmission fluid warning, Burnt smell after highway driving, Pink fluid visible on radiator support
Fix: Cooler lines to the external trans cooler can leak at crimp fittings or develop pinhole leaks from road debris. Replacement involves dropping splash shields and accessing lines near radiator. 2-3 hours labor plus fluid refill and relearn procedure.
Estimated cost: $600-1,200
Turbocharger Wastegate Rattle & Boost Control Issues
Rare · high severityTypical onset: 40,000-80,000 mi
Symptoms: Metallic rattle on cold start that disappears when warm, P0299 underboost or P0234 overboost codes, Limp mode activation, Reduced acceleration under load
Fix: Wastegate actuator rod can wear or stick. Turbo replacement on this engine requires significant teardown including coolant system drain, charge pipes, heat shields. 8-10 hours if turbo needs replacing. Early failures typically warranty-covered.
Estimated cost: $3,500-5,500
Head Gasket Seepage (Early Production Units)
Rare · high severityTypical onset: 15,000-45,000 mi
Symptoms: Coolant smell from engine bay, Slight coolant loss without visible leaks, White residue around head/block interface, Occasional misfire codes on cylinder 2 or 3
Fix: Small batch of early T24A engines had head gasket sealing issues, possibly related to torque-to-yield bolt procedures. Head gasket replacement on this turbo motor is 12-15 hours (includes turbo removal, timing components, coolant system flush). Almost always warranty work at this point.
Estimated cost: $4,500-7,000
Fuel Filter/Low-Pressure Pump Failures
Occasional · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Extended crank time when hot, Stumble or hesitation under acceleration, P0087 fuel pressure too low code, Engine stalling after sitting in heat
Fix: In-tank low-pressure pump or filter sock can clog from contamination. Access requires fuel tank drop (3-4 hours). Recommend replacing both pump and filter assembly together. Using Top Tier fuel helps prevent premature failure.
Estimated cost: $900-1,600
Too new to recommend used—wait until 2026+ model years prove the turbo four's longevity; if buying now, ensure full warranty coverage remains and all TSBs are completed.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.