2013–2024 LEXUS ES 300H

Typical onset: 80,000-150,000 mi

Symptoms: Burns 1+ quart of oil per 1,000 miles, Blue smoke from exhaust on startup or acceleration, Check engine light with P0300-series misfire codes, Oil fouling on spark plugs, Complete engine seizure if oil level drops critically low

Fix: Toyota issued TSB and extended warranty to 150k mi for affected VINs (2013-2015 primarily). Repair requires engine disassembly, piston ring replacement, cylinder honing—realistically 18-24 labor hours. Many shops opt for short block replacement or used engine swap (12-16 hours) due to cost-effectiveness. If out of warranty, this is financially totaling for many owners.

Estimated cost: $5,000-9,000

Typical onset: 90,000-140,000 mi

Symptoms: Transmission fluid spots under vehicle (pinkish-red), Fluid level drops on dipstick, Transmission slipping or delayed engagement if level gets low, Visible corrosion or seepage at cooler line connections near radiator

Fix: The steel lines corrode at fittings or develop pinhole leaks. Replacement involves draining fluid, removing undertray, replacing corroded lines and fittings—2.5-3.5 hours. Refill with Toyota WS ATF and verify no air in system.

Estimated cost: $400-700

Typical onset: 100,000-160,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Excessive vibration at idle, Visible tearing or separation of rubber from metal on mount inspection

Fix: Hydraulic transmission mount wears out from hybrid stop-start cycles. Replacement requires supporting engine/transaxle, removing old mount, installing OEM or quality aftermarket—2-2.5 hours. Use OEM; aftermarket mounts often fail prematurely on hybrids.

Estimated cost: $350-550

Typical onset: 120,000-180,000 mi

Symptoms: Check hybrid system warning light, P0A93 or P0A94 codes (inverter cooling system), Reduced power or refusal to enter EV mode, Whining or grinding noise from under hood near firewall passenger side

Fix: The electric coolant pump for the hybrid inverter/converter fails (bearings or motor). Located under the cowl area—requires removing wiper assembly and cowl panel for access. Pump replacement is 2.5-3 hours. Must use OEM pump; system requires specific hybrid coolant (pink, not traditional green/orange).

Estimated cost: $600-900

Symptoms: Vehicle won't start despite high-voltage battery being charged, Check hybrid system warning, Electrical glitches, radio resets, door lock issues, Clicking from under hood but no crank

Fix: The small 12V battery in the trunk powers computers and engages the hybrid system. Typical lifespan 4-6 years. Replacement is simple—trunk access, 0.3-0.5 hours—but MUST be registered/initialized with Techstream or equivalent scan tool to prevent system errors. DIY-friendly if you have the tool.

Estimated cost: $250-400

Typical onset: 100,000-150,000 mi

Symptoms: Squealing or grinding noise from front of engine, Coolant weeping from weep hole on pump, Engine overheating if pump fails completely

Fix: Mechanical water pump (separate from inverter pump) develops bearing noise or leaks. Accessible from front of engine—3-4 hours with accessory belt, coolant drain/refill. Do timing cover gasket and thermostat at same time if mileage warrants.

Estimated cost: $500-800