2004 HONDA NSX NA1

Typical onset: 60,000-120,000 mi

Symptoms: Window drops into door, Grinding noise when operating window, Window stuck in down position, Uneven window movement

Fix: Early NSX regulators use plastic clips that become brittle and fail. Requires door panel removal and regulator replacement. 2-3 hours per side if you're careful with the aluminum door skin fasteners.

Estimated cost: $600-900

Typical onset: Every 60,000-90,000 mi or 6-7 years

Symptoms: No symptoms until catastrophic failure, Interval-based preventive service

Fix: Non-interference engine but Honda strongly recommends replacement. Mid-engine layout makes access brutal—engine must be dropped or significantly tilted. Factor 8-12 hours for belt, tensioner, water pump, and coolant hoses. This is the single biggest maintenance hit on the platform.

Estimated cost: $2,500-4,500

Typical onset: 100,000-150,000 mi

Symptoms: Cold-start ticking that persists beyond 30 seconds, Louder valve train noise at idle, Loss of VTEC crossover smoothness, Check engine light with VTEC-related codes

Fix: C30A tappets can wear or develop varnish buildup, especially with extended oil change intervals. Diagnosis requires valve clearance check. If out-of-spec, tappet replacement involves removing cams. Budget 6-8 hours for a complete tappet replacement job. Many owners run thicker oil (10W-40) to quiet noise temporarily.

Estimated cost: $1,200-2,000

Typical onset: 80,000-120,000 mi

Symptoms: Clunk on throttle tip-in or coast-down, Vibration at idle in gear, Driveline slop during shifting, Visible cracking or separation of rubber mount

Fix: Rubber transmission mount fatigues with age and heat. Replacement requires transmission support and lifting. 2-3 hours labor. Upgraded polyurethane mounts are available but add NVH.

Estimated cost: $400-700

Typical onset: Not strictly mileage-dependent, age 15+ years

Symptoms: ABS warning light constant on, No ABS function during braking, Brake pedal feels normal but ABS inoperative

Fix: Early ABS modulators develop internal leaks or electrical failures. Honda discontinued the part years ago. Solutions include used OEM unit (~$800-1,500 sourced), aftermarket rebuild service, or complete ABS delete (track cars). Install is straightforward, 2-3 hours including bleeding.

Estimated cost: $1,200-2,500

Typical onset: Not mileage-dependent, age-related

Symptoms: Climate control display dead or dim, HVAC blower inoperative, No response from climate control buttons

Fix: Climate control unit uses electrolytic capacitors that dry out after 20+ years. Common DIY fix if you can solder; send-out repair services charge $150-300. Access requires center console removal, 1-2 hours total.

Estimated cost: $200-500

Symptoms: No sound from speakers, Intermittent audio cutting out, One or more speakers dead

Fix: Bose amps behind seats fail from heat and age. Repair or replacement required. Aftermarket head units bypass this entirely. 1-2 hours for amp access and replacement.

Estimated cost: $300-800