2004 NISSAN ALTIMA

Typical onset: 70,000-120,000 mi

Symptoms: Rattling from engine bay on cold start that disappears when warm, Loss of power and rough idle, Check engine light with multiple misfire codes (P0300-P0306), Metallic debris in oil during changes, Catastrophic engine failure if driven after symptoms appear

Fix: The pre-cats inside the exhaust manifolds disintegrate and get sucked back into cylinders, scoring cylinder walls and destroying pistons/rings. Requires complete engine rebuild or replacement. Preventive fix is replacing factory manifolds with aftermarket units before failure (8-10 hours labor). Post-failure needs full rebuild with bore/hone or short block swap (25-35 hours).

Estimated cost: $4,500-8,500

Typical onset: 80,000-130,000 mi

Symptoms: Whining or grinding noise during acceleration, Shuddering between 15-30 mph, Hesitation or slipping when accelerating from stop, Transmission overheating warning light, Sudden loss of forward gears

Fix: These early CVTs have weak valve bodies and fail bearings. Transmission cooler lines also leak into radiator causing cross-contamination (the 'strawberry milkshake of death'). Flush and external cooler addition extends life but most need full replacement or rebuild. R&R is 8-10 hours; rebuilt units run $2,500-3,200 plus installation.

Estimated cost: $3,200-4,800

Typical onset: 60,000-110,000 mi

Symptoms: No-start condition with cranking but no fire, Intermittent stalling while driving, especially when hot, Check engine light with P0335 or P0340 codes, Engine cuts out then restarts after cooling

Fix: Sensor mounted on bellhousing fails from heat cycling. Common failure point that leaves you stranded but easy fix. Replace sensor and connector pigtail if corroded (1.5-2 hours labor). Always replace when doing transmission work as access is same.

Estimated cost: $180-320

Typical onset: 70,000-100,000 mi

Symptoms: Clunking over bumps from front end, Steering wheel off-center after hitting potholes, Uneven tire wear on inside edges, Wandering or loose steering feel

Fix: Front LCA bushings crack and separate, most common on driver side. Cannot press new bushings into old arms on this chassis—must replace complete control arms. Both sides plus alignment is 2.5-3 hours. Always do both sides and alignment together.

Estimated cost: $400-650

Typical onset: 90,000-140,000 mi

Symptoms: Ticking noise from engine that increases with RPM, Exhaust leak smell in cabin with heat on, Visible soot around manifold flange, Failed emissions test due to leak pre-O2 sensor

Fix: Studs corrode and snap at cylinder head. Middle studs most common. Requires manifold removal and extraction of broken studs, often need helicoil inserts. 4-6 hours labor depending on how many studs break during removal. Use anti-seize on reinstall.

Estimated cost: $500-950

Symptoms: One or both low beams intermittent or dead, Melted plastic smell near headlights, Headlight bulbs burn out repeatedly, Flickering headlights

Fix: Factory harness undersized for current draw, connector melts at bulb socket. Multiple NHTSA recalls but not all VINs covered. Requires replacement pigtail or entire harness depending on damage (1-2 hours per side). Upgrade to relayed harness prevents recurrence.

Estimated cost: $150-400

Typical onset: 80,000-120,000 mi

Symptoms: Excessive vibration at idle in drive, Clunk when shifting from reverse to drive, Engine rocks visibly when revving in park, Harsh engagement into gear

Fix: Hydraulic mounts crack and leak fluid. Front mount and transmission mount most common. Replace all three mounts at once (upper strut tower, front, and trans mount) as labor overlaps. Total 3-4 hours for all three. OEM mounts preferred over aftermarket.

Estimated cost: $450-750