2017 LEXUS LS 600H

Typical onset: 80,000-150,000 mi

Symptoms: Check engine light with P0A93 or P0A80 codes (hybrid system malfunction), Temperature gauge climbing higher than normal during hybrid operation, Loss of power in EV mode or rough transitions between gas and electric, Metal debris in oil during changes, dropping oil pressure, Knocking or ticking that worsens with heat

Fix: The hybrid system runs hotter than conventional V8s, and when the transmission oil cooler or cooling system develops issues, it can cook the engine internals. Pistons crack, rings fail, bearings get starved. You're looking at 40-60 hours for a complete engine rebuild with new pistons, rings, bearings, and often head gaskets. Short block replacement is 35-45 hours if you catch it before head damage.

Estimated cost: $12,000-22,000

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid mixing with coolant (strawberry milkshake in overflow tank), Overheating warnings on dash, Harsh or delayed shifts, Pink or brown residue in coolant reservoir, Transmission slipping after engine reaches operating temp

Fix: The integrated oil cooler for the CVT fails internally, cross-contaminating fluids. This requires cooler replacement (2.5-3.5 hours), complete coolant flush, transmission fluid replacement, and often transmission teardown if contamination went far. If caught early, just cooler and fluids. If driven after mixing, you're rebuilding the transmission too.

Estimated cost: $1,800-8,500

Typical onset: 60,000-100,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle that changes when putting in gear, Excessive movement felt through shifter during acceleration, Drivetrain noise over bumps

Fix: The hybrid system's added weight and constant engine start/stop cycles kill the transmission mount faster than conventional LS models. Replacement is straightforward but requires supporting the drivetrain. 2-3 hours labor for the main mount, sometimes the side mounts need doing simultaneously.

Estimated cost: $650-1,200

Typical onset: 90,000-140,000 mi

Symptoms: Hard starting after sitting, especially when hot, Intermittent stumble or hesitation under acceleration, P0087 or P0088 fuel pressure codes, Rough idle that smooths out above 1500 RPM, Fuel smell near engine bay

Fix: The high-pressure fuel pump and filter assembly can fail or develop internal leaks. The fuel filter is integrated and rarely serviced by owners, leading to pump strain. Pump replacement is 3-4 hours (tank drop), filter is 1.5-2 hours but often done together. Direct injection systems are unforgiving of fuel system neglect.

Estimated cost: $1,400-2,800

Typical onset: 100,000-150,000 mi

Symptoms: Reduced electric-only range, Hybrid system warning light, Battery pack runs hotter than normal (can see in diagnostic mode), Fan noise absent when it should be running, Reduced fuel economy as system avoids using battery

Fix: The traction battery has a dedicated cooling fan that pulls cabin air. When it fails, the battery overheats and the system limits EV operation to protect itself. Fan replacement is 2-3 hours, but often the intake filter is clogged and never serviced, which kills the fan prematurely. Clean filter every 30k or it'll cost you.

Estimated cost: $800-1,500

Typical onset: 120,000+ mi

Symptoms: No-start condition with cranking but no fire, Intermittent stalling at any speed, P0335 or P0340 codes (crank/cam sensor correlation), Engine runs but misfires on multiple cylinders, Timing rattle on cold start that disappears when warm

Fix: The crank sensor can fail outright, but more insidious is timing chain stretch or VVT system wear causing correlation issues. Sensor itself is 1.5 hours, but if you're chasing timing problems, you're into timing chain replacement (18-24 hours) with cam phasers. The hybrid start/stop puts extra stress on the timing system.

Estimated cost: $350-6,500