2005 NISSAN QUEST

Typical onset: 90,000-150,000 mi

Symptoms: Check engine light with misfire codes (P0300-P0306), Loss of power and rough running, Rattling noise from catalytic converter on cold start, Metal debris visible in spark plug wells, Sudden catastrophic failure with no warning

Fix: The pre-cats mounted in the exhaust manifolds deteriorate and send ceramic honeycomb debris back into cylinders during valve overlap, scoring cylinder walls and destroying pistons/rings/bearings. Requires engine rebuild or replacement (40-60 hours labor), new manifolds with cats, all gaskets. Some shops do short-block swaps to save time.

Estimated cost: $5,000-8,500

Typical onset: 80,000-140,000 mi

Symptoms: Transmission slipping or delayed engagement, Milky or strawberry-colored fluid in transmission or radiator, Overheating transmission, Complete transmission failure after coolant mixing

Fix: The internal radiator transmission cooler fails, allowing coolant and ATF to mix—this destroys the transmission within days or miles. Fix requires transmission rebuild or replacement (18-24 hours), new radiator, complete fluid system flush, and often new torque converter. Install external cooler and bypass internal one to prevent recurrence (add 2 hours).

Estimated cost: $3,500-6,000

Typical onset: 70,000-110,000 mi

Symptoms: Clunking when shifting from park to drive/reverse, Excessive vibration at idle, Visible engine movement when accelerating, Transmission sits visibly lower on one side

Fix: The front and rear transmission mounts fail due to weight and stress from the transverse V6/CVT combo. Replacement requires supporting drivetrain and removing several subframe bolts (3-5 hours for both mounts). OEM mounts recommended—aftermarket fail quickly.

Estimated cost: $450-750

Typical onset: 100,000-160,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Oil contamination in coolant (or vice versa), Overheating under load, Bubbles in coolant reservoir when running

Fix: Often occurs after partial pre-cat damage causes localized overheating. Requires cylinder head removal, resurfacing, new gaskets, timing components inspection (20-28 hours). If caught early before warping, heads can be saved. Many shops recommend full engine replacement at this point given other risks.

Estimated cost: $2,800-4,500

Typical onset: 120,000+ mi

Symptoms: Hard starting after sitting, Hesitation or stumbling under acceleration, Loss of power on highway, Stalling at idle after driving

Fix: The in-tank fuel filter (part of pump assembly) clogs from debris and age. Requires dropping fuel tank (3-4 hours) and replacing entire pump assembly—filter not sold separately. Common preventive replacement during transmission work since tank must come down anyway.

Estimated cost: $600-900

Symptoms: Second-row seat moves or tips forward unexpectedly, Latch does not engage properly when seat is returned from folded position, Visible wear or damage to latch mechanism

Fix: Covered under NHTSA recall campaigns—latch mechanisms can fail to secure seat properly, risking occupant ejection in crashes. Dealer repair is free if recall not previously completed. Check VIN for open recalls before purchase (0.5-1 hour dealer time).

Estimated cost: $0 (recall repair)