2017 LEXUS RC 350

Typical onset: 40,000-80,000 mi

Symptoms: Sudden loss of power, heavy metallic knocking at idle, Oil consumption over 1 qt per 1,000 mi before failure, Check engine light with multiple misfire codes (P0300-P0306), Metal shavings in oil during change

Fix: Complete engine replacement or long-block rebuild—connecting rod bearings and main bearings spin, scoring crank and block. Carbon buildup on intake valves (direct injection flaw) can trigger pre-detonation that hammers bearings. 35-50 labor hours for R&R and rebuild with new pistons, rings, bearings, gaskets, timing components.

Estimated cost: $8,000-15,000

Typical onset: 60,000-100,000 mi

Symptoms: Red ATF puddle under front of vehicle, Transmission temp warning light on dash, Burnt smell from engine bay after highway driving, Low transmission fluid level on dipstick check

Fix: Rubber sections of cooler lines crack where they connect to hard lines near radiator. Replace both cooler lines and inspect external cooler for clogging. 2-3 labor hours plus fluid flush.

Estimated cost: $400-700

Typical onset: 70,000-110,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration through shifter at idle in Drive, Excessive drivetrain movement visible during throttle blip in Park

Fix: Rear transmission mount hydraulic damper fails—common on this 8-speed AA80E. Replace mount; 1.5-2 hours on a lift.

Estimated cost: $250-450

Typical onset: 50,000-90,000 mi

Symptoms: Rough cold-start idle, smooths out after 30 seconds, Loss of low-end power and throttle response, Misfires under load (P0300-P0306 codes), Failed emissions test due to incomplete monitors

Fix: Intake valves caked with carbon—no fuel wash on DI engines. Walnut-blast cleaning required; remove intake manifold, mask ports, media-blast each valve. 6-8 labor hours including manifold gaskets and throttle body cleaning.

Estimated cost: $600-1,200

Typical onset: 80,000-130,000 mi

Symptoms: No-start condition with crank but no fire, Engine stumble or stall during hard acceleration, Whining noise from rear seat area while driving, Fuel pressure below 50 psi at rail (spec is 62-71 psi)

Fix: In-tank pump module fails—common across Lexus V6 platforms. Drop tank or access via rear seat service hole (RC requires tank drop). 3-4 labor hours including fuel system pressure relief and tank strap service.

Estimated cost: $800-1,400

Typical onset: 90,000-130,000 mi

Symptoms: Coolant seepage below timing cover, visible on lower skid plate, Squealing or grinding from front of engine at cold start, Coolant level drops slowly over weeks, Pink residue around water pump weep hole

Fix: Water pump bearing or seal fails. Timing cover removal not required on 2GR-FSE but requires serpentine belt, some accessory removal. 4-5 labor hours including coolant flush and thermostat inspection.

Estimated cost: $600-1,000