The 2016 IS 350 with the 2GR-FSE V6 is generally reliable, but carbon buildup on direct-injection intakes is unavoidable, and a subset of these engines experienced catastrophic bearing/piston failures due to manufacturing defects—though many were caught under warranty.
Carbon Buildup on Intake Valves (Direct Injection)
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: rough idle, hesitation on acceleration, misfires under load, reduced fuel economy
Fix: Walnut blasting intake valves requires removing intake manifold and cleaning each runner. 4-6 hours labor. Some shops use chemical induction cleaning as a band-aid, but physical media blasting is the real fix.
Estimated cost: $500-900
Engine Bearing and Piston Failure (Manufacturing Defect)
Rare · high severityTypical onset: 30,000-80,000 mi
Symptoms: metallic knocking from lower engine, sudden loss of oil pressure, engine seizure, metal shavings in oil
Fix: Complete engine rebuild or replacement required—pistons, bearings, possibly crankshaft if scored. This is a known defect on some 2GR-FSE engines from this era. 20-30 hours labor for rebuild, less for reman swap. Many caught under extended warranty.
Estimated cost: $8,000-15,000
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: transmission fluid spots under vehicle, low fluid level on dipstick, burnt transmission smell if driven low, slipping shifts if fluid critically low
Fix: Replace cooler lines and top off ATF. Lines corrode or crack at fittings. 2-3 hours labor depending on access and whether cooler itself needs replacement.
Estimated cost: $400-800
Transmission Mount Deterioration
Occasional · low severityTypical onset: 90,000-140,000 mi
Symptoms: clunk on hard acceleration or deceleration, vibration at idle in Drive, excessive driveline movement felt through shifter
Fix: Replace transmission mount (rubber isolator). Usually 1.5-2 hours labor. Common wear item on higher-mileage examples.
Estimated cost: $250-450
Water Pump Failure
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: coolant leak from timing cover area, whining noise from front of engine, overheating, coolant in oil (if seal fails catastrophically)
Fix: Water pump is behind timing cover—timing belt job labor applies even though this is a chain engine. 6-8 hours labor. Smart to do thermostat and hoses while you're in there.
Estimated cost: $1,200-1,800
Fuel Injector Seal Leaks and Carbon Fouling
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: fuel smell in cabin or engine bay, hard starting when hot, misfires, fuel in spark plug wells
Fix: Replace injector seals and possibly injectors if fouled beyond cleaning. Direct-injection injectors are expensive. 3-4 hours labor for seals, more if injectors need replacement.
Estimated cost: $600-1,500
Solid daily driver if the engine hasn't grenaded by now—carbon cleaning is annoying but manageable, and the rest is typical high-mileage wear; just budget for intake service every few years.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.