The 1998 Mark II is a robust JZ-platform sedan with legendary inline-six reliability, but age-related wear on turbos (GTE models), automatic transmissions, and cooling systems are the primary concerns at 20+ years old.
Automatic Transmission Slipping / Delayed Engagement (A340E/A650E)
Common · high severityTypical onset: 120,000-180,000 mi
Symptoms: Delayed 1-2 or 2-3 shift, especially when cold, Flare or slip between gears under moderate throttle, Shudder during torque converter lockup, Burnt transmission fluid smell
Fix: Fluid and filter service may buy time if caught early (2-3 hrs), but worn clutch packs typically require rebuild or replacement. Rebuild runs 12-16 hrs labor; used JDM unit swap is 8-10 hrs.
Estimated cost: $2,200-4,500
Turbocharger Failure (1JZ-GTE/2JZ-GTE Models)
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Blue smoke on startup or under boost, Whining or grinding noise from turbo, Loss of boost pressure / reduced power, Excessive oil consumption
Fix: Single turbo replacement on 1JZ-GTE is 6-8 hrs; twin setup on 2JZ-GTE can reach 10-12 hrs due to cramped engine bay. Upgraded aftermarket units common. Oil starvation from clogged lines often the root cause.
Estimated cost: $1,800-3,800
VVT-i Cam Gear Failure (1JZ-GE/GTE post-1996)
Occasional · medium severityTypical onset: 150,000-200,000 mi
Symptoms: Rough idle with CEL for VVT system, Rattling from front of engine at startup, Poor throttle response below 3,000 RPM, P1349 or P1346 VVT-i codes
Fix: Cam gear replacement requires timing cover removal and cam alignment, 5-7 hrs labor. Often done alongside timing belt service. Oil control valve cleaning may temporarily resolve early symptoms (1 hr).
Estimated cost: $800-1,500
Radiator and Heater Core Leaks
Common · medium severityTypical onset: 80,000-140,000 mi
Symptoms: Coolant smell in cabin (heater core), Green fluid pooling under front passenger side, Overheating in traffic or at idle, Foggy windshield with sweet smell
Fix: Radiator replacement is straightforward, 2-3 hrs. Heater core requires full dash removal on Mark II chassis, 8-10 hrs labor. Plastic end-tank radiators crack with age; heater cores corrode internally.
Estimated cost: $400-800 (radiator), $1,200-2,000 (heater core)
Rear Subframe Bushing Deterioration
Common · low severityTypical onset: 100,000+ mi
Symptoms: Clunking over bumps from rear suspension, Wandering or vague steering feel, Rear-end feels loose during lane changes, Visible cracking in rubber subframe mounts
Fix: Replacing all four subframe bushings requires dropping the subframe, 4-6 hrs. Polyurethane upgrades popular for tighter handling. Differential bushings often done simultaneously.
Estimated cost: $600-1,200
Power Steering Pump Whine and Leaks
Occasional · low severityTypical onset: 120,000-160,000 mi
Symptoms: Whining noise that changes with steering input, Stiff steering when cold, Fluid leaking from pump or high-pressure line, Foamy or dark power steering fluid
Fix: Pump replacement is 2-3 hrs; rack seals add another 4-5 hrs if leaking. High-pressure hose failures common due to age. Flush system with fresh fluid to extend life.
Estimated cost: $350-700 (pump), $800-1,400 (rack)
Ignition Coil and Spark Plug Deterioration (All Engines)
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Rough idle or misfire under load, CEL with P030X misfire codes, Hesitation during acceleration, Reduced fuel economy
Fix: Coil packs and plugs should be serviced as a set every 60k-80k mi. Six-cylinder job takes 2-3 hrs on 1JZ/2JZ due to coil-on-plug design. Use OEM-spec NGK or Denso plugs.
Estimated cost: $400-700
Buy one if it has documented maintenance history—these JZ engines run 300k+ with care, but neglected examples become money pits fast due to expensive turbo and transmission work.
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.