2009 LEXUS RX 350

Typical onset: 80,000-150,000 mi

Symptoms: Blue smoke from exhaust on startup or acceleration, Oil level drops 1+ quart between changes, Fouled spark plugs causing misfires, Carbon buildup on intake valves worsening the problem, Catastrophic engine failure if oil runs too low

Fix: Toyota issued TSB but no recall. Proper fix requires engine disassembly to replace pistons and rings (16-20 hours labor), but many opt for used/rebuilt engine swap (12-15 hours) due to cost. Some try top-end carbon cleaning as temporary measure (4-6 hours), but it rarely solves root cause.

Estimated cost: $4,500-8,000

Typical onset: 90,000-140,000 mi

Symptoms: Pink or red fluid pooling under vehicle (front passenger side), Transmission slipping or harsh shifts after leak develops, Low transmission fluid level on dipstick, Burnt transmission smell if driven low on fluid

Fix: Metal transmission cooler lines corrode where they connect to radiator. Must replace both cooler lines and often the radiator if contamination occurred (3-5 hours). If transmission ran low on fluid, internal damage may require rebuild.

Estimated cost: $800-1,500

Typical onset: 100,000-150,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Excessive vibration at idle in Drive, Visible engine movement when revving in park, Transmission feels like it's 'dropping' into gear

Fix: Rear transmission mount deteriorates from heat and age. Replacement requires supporting transmission and removing cross-member bolts (2-3 hours). OEM mount recommended as aftermarket fail quickly.

Estimated cost: $350-600

Typical onset: 90,000-120,000 mi

Symptoms: Coolant leak from weep hole on pump, Squealing or grinding noise from front of engine, Engine overheating, Coolant puddle under vehicle (center-front)

Fix: This is a timing belt engine—water pump is driven by timing belt and should be replaced during belt service. If pump fails between services, you're doing timing belt job twice. Timing belt service includes pump, tensioner, idler pulleys (6-8 hours).

Estimated cost: $1,200-1,800

Typical onset: 120,000+ mi

Symptoms: Rattling noise on cold start for 2-5 seconds, Noise disappears once oil pressure builds, Check engine light with P0010/P0011/P0012 codes (VVT system), Rough idle or slight hesitation on acceleration

Fix: VVT-i oil control valve screens clog with sludge, or VVT gears wear internally. Replace both bank oil control valves and clean screens (2-3 hours). If gears are worn, requires timing cover removal (6-8 hours).

Estimated cost: $400-1,400

Typical onset: 100,000-140,000 mi

Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Uneven tire wear (inner or outer edge), Vibration through steering wheel at highway speeds

Fix: Front lower control arm bushings crack and separate. Lexus only sells complete control arm assemblies—no separate bushings available. Replace both sides for even handling (3-4 hours including alignment).

Estimated cost: $800-1,200

Typical onset: 120,000-160,000 mi

Symptoms: Battery warning light illuminated, Dimming headlights or interior lights, Electrical accessories acting erratically, Battery voltage below 13.5V with engine running, Whining or grinding noise from alternator

Fix: Denso alternator typically lasts but eventually fails. Replacement is straightforward on this V6 (1.5-2 hours). Use OEM Denso or high-quality reman—cheap alternators fail quickly.

Estimated cost: $450-750