2002 NISSAN QUEST

Typical onset: 90,000-150,000 mi

Symptoms: White smoke from exhaust, Milky oil on dipstick or in valve covers, Rapid coolant loss with no visible leaks, Overheating or erratic temperature gauge, Rough idle, misfires, eventual no-start

Fix: Head gaskets blow between cylinders and coolant passages, dumping coolant into oil. Once coolant mixes with oil, bearing surfaces get destroyed within hundreds of miles. If caught early, head gaskets on both banks run 12-16 hours labor. If driven after contamination starts, you're looking at complete engine rebuild (pistons, bearings, rings, machine work) at 30-40 hours, or used engine swap at 18-24 hours.

Estimated cost: $3,500-7,500

Typical onset: 80,000-130,000 mi

Symptoms: Strawberry milkshake appearance in radiator or overflow tank, Transmission slipping or delayed engagement, Coolant level rising unexpectedly, Pink or foamy fluid on transmission dipstick

Fix: Internal cooler in radiator fails, allowing pressurized coolant to mix with ATF. Destroys transmission within days if driven. Requires radiator replacement, transmission flush (sometimes multiple flushes), new cooler lines. If trans is damaged, full rebuild or replacement adds 12-16 hours. Catch it immediately by checking radiator fluid color weekly.

Estimated cost: $800-4,000

Typical onset: 70,000-120,000 mi

Symptoms: Severe clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Visible engine/trans movement when accelerating, Banging noise over bumps

Fix: Rubber mount deteriorates and hydraulic fluid leaks out. Engine/trans torques excessively. Straightforward replacement, 2-3 hours with proper support equipment. Must inspect all three mounts while in there.

Estimated cost: $250-450

Typical onset: 100,000-160,000 mi

Symptoms: Coolant seeping from front or rear of engine, Rough idle or high idle, Small coolant loss over weeks, Coolant smell in cabin when heater runs

Fix: Lower intake plenum gaskets leak externally. Not catastrophic like head gaskets but can cause vacuum leaks and minor coolant loss. Upper plenum removal required, 4-6 hours labor. Use OEM gaskets—aftermarket ones fail quickly.

Estimated cost: $500-900

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting when hot, Loss of power under load or at highway speeds, Intermittent stalling, Whining noise from rear of vehicle

Fix: In-tank filter screen clogs, starving pump. External filter (when present) also restricts flow. Requires tank drop for proper cleaning or pump replacement, 3-4 hours. Many techs skip the external filter replacement and regret it.

Estimated cost: $400-800

Typical onset: 80,000-140,000 mi

Symptoms: Intermittent stalling when hot, No-start after sitting in sun, Erratic idle or surging, Check engine light with crank sensor codes

Fix: Crank angle sensor inside distributor fails from heat. Sometimes the whole distributor needs replacement due to shaft wear. 2-3 hours labor for distributor R&R and timing reset. Use OEM Nissan parts—aftermarket sensors fail within months.

Estimated cost: $400-700