2019 LEXUS RX 350

Typical onset: 30,000-80,000 mi

Symptoms: Burning a quart of oil every 1,000-2,000 miles with no visible leaks, Blue smoke on cold starts or hard acceleration, Low oil warning light between changes, Carbon buildup on intake valves exacerbating the problem

Fix: This is a known defect with certain 2GR-FKS builds where piston rings don't seat properly or carbon packs behind them. Proper fix requires engine disassembly, new pistons and rings, cylinder honing, and often valve cleaning. Some dealers have done short-block replacements under extended warranty. Expect 18-24 labor hours for a full internal rebuild.

Estimated cost: $6,000-9,500

Typical onset: 50,000-90,000 mi

Symptoms: ATF puddles under the vehicle, often passenger side, Transmission running hot or slipping under load, Burnt smell after highway driving, Low fluid level on dipstick check (if accessible)

Fix: The cooler lines or the cooler itself develop leaks due to corrosion or vibration fatigue where they connect to the transmission or radiator. Replacement involves dropping the splash shield, replacing lines and sometimes the cooler assembly. 2-3 hours labor plus fluid refill and system flush.

Estimated cost: $600-1,200

Typical onset: 60,000-100,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration at idle that disappears when in Neutral, Excessive engine/trans movement visible during throttle blips

Fix: The rear transmission mount (also called the pitch stopper) wears out and allows excessive drivetrain movement. Requires lifting the transmission slightly to swap the mount. 1.5-2 hours labor.

Estimated cost: $350-550

Typical onset: 80,000-120,000 mi

Symptoms: Rough idle, especially when cold, Hesitation or stumble on light throttle, Misfires on one or more cylinders (P030X codes), Reduced fuel economy

Fix: The 2GR-FKS is direct-injection only with no port injection to clean valves. Carbon packs on intake valves over time. Requires walnut blasting or media cleaning of all six intake ports with intake manifold removed. 4-6 hours labor depending on access and whether you clean injectors at the same time.

Estimated cost: $800-1,400

Symptoms: Hesitation when accelerating from a stop or rolling speed, Delayed downshift when asking for passing power, Occasional harsh 2-3 or 3-4 upshift, Transmission 'hunting' between gears on slight grades

Fix: Toyota's 8-speed (AA80E) has adaptive learning that sometimes results in sluggish response. Often improved with a full fluid drain-and-fill (not a flush) and TCM software update from the dealer. If hardware issue, valve body replacement runs 8-10 hours labor, but software fixes resolve most cases. Start with fluid service and reflash.

Estimated cost: $250-500 for fluid/reflash; $2,200-3,200 if valve body needed

Typical onset: 90,000-140,000 mi

Symptoms: Hard start or extended cranking when engine is hot, Single-cylinder misfire that moves when injectors are swapped, Fuel smell in cabin or engine bay, Rough running that clears up after a few minutes

Fix: Direct injectors can coke up or fail electrically. Diagnosis involves swapping suspected injector to another cylinder to confirm. Replacement is straightforward but requires fuel rail removal. 2-3 hours labor for one injector; if doing all six, add another 1-2 hours. OE Denso injectors are pricey.

Estimated cost: $400-700 per injector; $1,800-2,800 for all six