The 2004 Mark II is a robust rear-drive sedan built on Toyota's proven JZX platform, sharing DNA with the Chaser and Cresta. The 1JZ and 2JZ inline-sixes are legendary for durability, but age and maintenance neglect create predictable failure points—especially in the valvetrain, cooling system, and automatic transmission mounts.
Automatic Transmission Mounts Collapsing
Common · medium severityTypical onset: 80,000-140,000 mi
Symptoms: Clunking or banging when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Visible sagging of transmission tailhousing when inspected on lift
Fix: Replace rear transmission mount and crossmember bushings. Requires lifting transmission slightly with jack. 2-3 hours labor at independent shop.
Estimated cost: $250-500
Hydraulic Valve Lifters Ticking and Collapsing
Common · medium severityTypical onset: 100,000-180,000 mi
Symptoms: Loud ticking or tapping from valve cover area, especially cold start, Ticking that persists after warm-up indicates collapsed lifter, Loss of power if lifter fully fails and valve doesn't open properly
Fix: Early-stage: often resolves with oil change using quality 10W-30 and running engine cleaning additive. Persistent cases require valve cover removal, shim-over-bucket inspection, and lifter replacement. Full lifter job is 6-8 hours labor if doing all 12 or 24 (1JZ/2JZ respectively). Many techs replace only the noisy ones to save cost.
Estimated cost: $800-1,800
Head Gasket Failure (2JZ-GTE Twin-Turbo)
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: White smoke from exhaust on cold start that clears after warm-up, Coolant loss with no visible leaks, Milky oil on dipstick or oil cap if coolant mixing with oil, Overheating or fluctuating temp gauge
Fix: Factory head gasket on 2JZ-GTE is notorious for failing between cylinders 5 and 6. Proper fix requires head removal, resurfacing (usually warped 0.003-0.008 in), ARP studs, and multi-layer steel gasket. Machine work adds 2-3 days turnaround. Total 18-24 hours labor including coolant system flush and timing belt while apart.
Estimated cost: $2,800-4,500
Harmonic Balancer Rubber Deterioration
Occasional · medium severityTypical onset: 90,000-160,000 mi
Symptoms: Visible separation between inner hub and outer ring on balancer, Serpentine belt walking off pulleys or shredding prematurely, Rough idle vibration that wasn't there before, Timing marks no longer aligning during service
Fix: Remove serpentine belt and front accessories to access crank pulley. Balancer puller required—impact method risks keyway damage on these engines. 2.5-3.5 hours labor. OEM Toyota part strongly recommended over aftermarket.
Estimated cost: $400-700
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 100,000-180,000 mi
Symptoms: ATF puddle under front of car after sitting overnight, Low transmission fluid on dipstick despite no visible pan leaks, Hard or delayed shifts due to low fluid level, Cooler lines visibly corroded or weeping at crimped fittings
Fix: Replace steel cooler lines running from transmission to radiator-mounted cooler. Lines rust from outside-in at bends and crimps. Pre-bent replacements available or custom fabrication. 2-3 hours labor including fluid refill and system purge.
Estimated cost: $350-600
Camshaft Position Sensor Failure (1JZ-GTE)
Occasional · high severityTypical onset: 80,000-150,000 mi
Symptoms: No-start or cranks but won't fire, Stalling at random, usually restarts after sitting 10-30 minutes, Check engine light with P0340 code (cam position sensor circuit), Intermittent loss of power under boost
Fix: Sensor located under intake plenum on 1JZ-GTE, requires upper intake manifold removal for access. Connector corrosion common—clean terminals before replacing sensor. 2-3 hours labor including plenum gasket.
Estimated cost: $300-550
Fuel Filter Clogging (All Engines)
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Hesitation or stumble under hard acceleration, Engine cutting out momentarily at highway speeds, Difficult starting when fuel tank below half, Loss of top-end power
Fix: In-line fuel filter under chassis near fuel tank. Often overlooked in maintenance schedules. Filter clogs from tank rust and old fuel degradation—these cars often sit. 0.5-1 hour labor, depressurize fuel system first.
Estimated cost: $80-150
Absolutely buy one if maintenance records show regular oil changes and timing belt service—these drivetrains easily hit 300,000 mi, but neglected examples become money pits fast around 120,000 mi.
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.