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2004 INFINITI I30

3.0L V6•FWD•AUTOMATIC•ev
5-Year Cost of Ownership
$7,934 maintenance + known platform issues
~$1,587/yr · 130¢/mile equivalent · $2,125 maintenance + $5,109 expected platform issues
Common Problems & Known Issues

The 2004 I30 (essentially a rebadged Maxima) shares the VQ30DE V6 and is generally reliable, but suffers from well-documented automatic transmission failure, timing chain/guide wear, and mass airflow sensor issues that plague this generation of Nissan/Infiniti products.

Automatic Transmission Failure (RE4F04A/B)

Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Harsh or delayed 2-3 upshift, especially when cold, Slipping in 3rd or 4th gear under load, Transmission overheating, burnt fluid smell, Check engine light with P0725 (engine speed input circuit) or P1702 (TCM communication)
Fix: The RE4F04A/B is notorious for valve body wear and clutch pack failure. Most need a full rebuild or replacement by 120k. Figure 12-16 hours labor for R&R and rebuild, plus parts (clutches, bands, valve body, torque converter). Used replacement is a gamble—many are already marginal.
Estimated cost: $2,800-4,200

Timing Chain Guide and Tensioner Failure

Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: Rattling or whining noise from front of engine on cold start, subsides after 10-15 seconds, Metallic grinding or slapping noise at idle, Check engine light with P0011/P0021 (cam timing over-advanced/retarded), Loss of power, rough idle if chain has jumped time
Fix: VQ30DE upper timing chain guides crack and fall into the timing cover. Lower chain can then slap and jump. Requires front cover removal, both chains, guides, tensioners, and VVT sprockets. Water pump and seals while you're in there. 10-14 hours labor. If you hear the rattle, don't wait—catastrophic engine damage follows.
Estimated cost: $1,800-2,800

Mass Airflow Sensor (MAF) Contamination

Common · low severity
Typical onset: 60,000-120,000 mi
Symptoms: Hesitation or stumble on acceleration, especially 2,000-3,000 RPM, Rough idle, stalling at stoplights, Check engine light with P0171/P0174 (system too lean) or P0101 (MAF range/performance), Poor fuel economy, 2-4 MPG drop
Fix: The hot-wire MAF gets contaminated by oil vapor from the PCV system or aftermarket oiled air filters. Clean with MAF-specific cleaner first (0.5 hours labor). If that doesn't hold, replacement MAF is 1 hour labor. OEM Hitachi unit is $200-300, cheap aftermarket ones throw codes.
Estimated cost: $80-450

Crankshaft Position Sensor Failure

Occasional · high severity
Typical onset: 80,000-140,000 mi
Symptoms: No-start or intermittent stalling, often when engine is hot, Engine cranks but won't fire, Check engine light with P0335 (crank sensor circuit) or P0340 (cam sensor), Tachometer drops to zero while driving, then car dies
Fix: Located at the back of the engine near the bellhousing—miserable access. Sensor itself is cheap ($40-80), but labor is 2-3 hours because you're working blind between engine and firewall. Heat kills these sensors. Replace cam sensor at same time if you're in there (another hour).
Estimated cost: $250-500

Engine and Transmission Mounts Collapse

Common · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Clunking or banging when shifting into drive or reverse, Vibration at idle, especially with A/C on, Excessive engine movement visible from under hood during acceleration, Transmission shifter vibrates
Fix: The hydraulic front mount and torque mount fail, allowing the powertrain to rock. All four mounts should be done together (front, rear, left, right torque). 3-4 hours labor. OEM mounts are pricey but last; aftermarket ones are hit-or-miss and may increase NVH.
Estimated cost: $600-1,000

Front Lower Control Arm Bushings and Ball Joints

Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Tire wear on inside or outside edge, Alignment won't hold after adjustment
Fix: The front LCA bushings crack and ball joints wear. Most shops replace the entire LCA assemblies rather than press bushings (2.5-3 hours per side including alignment). If you're doing one side, do both—the other is close behind. Alignment is mandatory after.
Estimated cost: $700-1,100

Alternator Failure

Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Battery light on or flickering, Dimming headlights at idle, Electrical accessories acting erratically, Whining or grinding noise from alternator pulley, Battery constantly dying, won't hold charge
Fix: Mitsubishi-built alternator is accessible but requires removing the upper radiator hose and coolant overflow. 2-2.5 hours labor. Remanufactured units are fine. Test battery and charging system before condemning alternator—parasitic draw or bad battery can mimic alternator failure.
Estimated cost: $450-700
Owner tips
  • Change transmission fluid every 30,000 miles with genuine Nissan Matic-J fluid—do NOT use generic ATF. Drain-and-fill method, not flush.
  • Use top-tier gasoline and replace fuel filter every 60k to keep injectors clean. These engines are sensitive to carbon buildup on intake valves.
  • Listen for timing chain rattle on cold starts—catch it early before guides disintegrate. If you hear it, budget for the job immediately.
  • Replace serpentine belt and tensioner every 60k; a snapped belt will overheat the engine in traffic. Check belt for cracks at every oil change.
  • Inspect engine and transmission mounts at 80k—collapsed mounts accelerate CV axle and transmission wear.
A solid daily driver if the transmission has been maintained and timing chains are quiet, but budget $3,000-5,000 for deferred maintenance on any 150k+ example—these are 20-year-old cars now and the big-ticket items are coming due.
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.
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