2014 LEXUS RX 350

Typical onset: 60,000-120,000 mi

Symptoms: Burning more than 1 quart per 1,200 miles, Blue smoke on cold start or hard acceleration, P0300-P0306 misfires when oil gets critically low, Carbon buildup on spark plugs and intake valves

Fix: Toyota issued TSB-0094-14 for engines with specific serial ranges. Proper fix is complete short block replacement with updated pistons/rings. Takes 18-24 labor hours at a competent shop. Some try piston ring replacement alone (12-15 hrs) but success rate is poor if cylinder glazing exists. Always verify VIN eligibility for potential goodwill coverage even out of warranty.

Estimated cost: $5,000-8,500

Typical onset: 80,000-140,000 mi

Symptoms: Pink/red fluid puddle under engine bay, driver's side, Transmission running hotter than normal, Low ATF level warning (if equipped), Whining noise from transmission when low on fluid

Fix: The steel cooler lines corrode where they connect to the radiator, especially in salt-belt states. Replace both cooler lines and reseal radiator fittings. 2.5-3.5 hours labor. Flush transmission if fluid got low enough to cause slipping. Some techs replace the entire external cooler assembly as preventive.

Estimated cost: $450-900

Typical onset: 70,000-110,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive with brake applied, Excessive drivetrain movement visible during throttle blips, Rubber mount shows visible cracking or fluid leakage

Fix: The rear transmission mount (engine side) fails first due to heat and load cycles. Front mount typically lasts longer. Replace the failed mount—about 1.5 hours labor with proper lift access. OEM Toyota/Lexus mounts last significantly longer than economy aftermarket versions.

Estimated cost: $280-450

Typical onset: 90,000-150,000 mi

Symptoms: Rough idle that smooths out after warm-up, Hesitation or stumble during light acceleration, Misfires on cold start (P0300-P0306), Reduced fuel economy over time

Fix: The 2GR-FE is port-injected (not direct), so carbon buildup is slower than GDI engines, but PCV system issues or excessive oil consumption accelerate deposits. Walnut blasting intake valves takes 4-6 hours. Always address root cause (PCV valve, oil consumption) or it returns quickly. Some shops use chemical induction cleaning as a band-aid.

Estimated cost: $500-950

Typical onset: 100,000-150,000 mi

Symptoms: Coolant residue or minor drips from weep hole under water pump, Sweet coolant smell after engine reaches operating temp, Slow coolant loss requiring top-offs every few months, No overheating until pump fails completely

Fix: Water pump bearings wear and seals start weeping. Catches people off-guard because Toyota pumps usually last 150k+. Replace water pump and timing cover gasket while you're there—about 4-5 hours labor. Always do thermostat and coolant flush at same time since system is open.

Estimated cost: $650-1,100

Typical onset: 120,000+ mi

Symptoms: Fuel smell in cabin or engine bay, especially after sitting overnight, Visible fuel seepage on intake manifold or injector bodies, Rough running or hard start when engine is hot-soaked, Check engine light for fuel trim codes (P0171/P0174)

Fix: Upper and lower injector o-rings harden with age and heat cycles. External leaks are fire hazards. Replace all six injector o-ring kits and clean injector bores in manifold. 3-4 hours labor if just doing o-rings; some opt to replace injectors entirely at this mileage. Do NOT delay this repair.

Estimated cost: $400-750