2002 FORD EXPLORER

Typical onset: 100,000-150,000 mi

Symptoms: Rattling noise on cold start that disappears after warmup, Check engine light with cam/crank correlation codes (P0340, P0345), Rough idle or stalling, Catastrophic engine failure if chains jump timing

Fix: Replace plastic timing chain cassettes, guides, tensioners, and chains on both banks. Requires removing front covers, valve covers, timing components. 12-16 hours labor. Many shops recommend full engine rebuild or replacement at this point due to potential internal damage from stretched chains. If caught early, cassette replacement alone runs 10-12 hours.

Estimated cost: $2,500-5,000

Typical onset: 90,000-140,000 mi

Symptoms: Harsh 2-3 or 3-4 shifts, Slipping in 3rd or 4th gear under load, No reverse or delayed engagement, Burnt transmission fluid smell, Whining or grinding noises

Fix: Forward clutch pack failure and servo bore wear are the usual culprits. Rebuild requires removal (6-8 hours), complete teardown, new clutches, bands, servos, solenoid pack, and torque converter. Many shops recommend remanufactured unit due to labor cost overlap. R&R plus rebuild: 14-18 hours total.

Estimated cost: $2,800-4,500

Typical onset: 120,000-180,000 mi

Symptoms: Howling or whining from rear end that increases with speed, Grinding noise during acceleration, Vibration at highway speeds, Metal shavings in differential fluid

Fix: Pinion bearing and seal replacement requires setting up pinion depth and backlash with special tools. If caught early: 4-5 hours for pinion bearing and seal. If run too long, ring and pinion damage requires full rebuild: 6-8 hours plus parts.

Estimated cost: $800-2,200

Typical onset: 80,000-120,000 mi

Symptoms: Clunking noise over bumps from front end, Steering wander or looseness, Uneven tire wear on inside edge, Visible play when prying on front wheels (vehicle raised)

Fix: Lower ball joints are riveted into the control arms. Proper repair involves drilling out rivets and bolting in new joints or replacing entire lower control arms (easier). 2.5-3.5 hours per side. Critical safety issue—complete separation causes loss of control. Both sides typically need service at same time.

Estimated cost: $600-1,000

Typical onset: 90,000-150,000 mi

Symptoms: Check engine light with P1518 code, Loss of power above 3,000 RPM, Rough idle in some cases, Rattling from intake manifold area

Fix: Plastic actuators and rods inside the intake manifold break or seize with carbon buildup. Requires upper intake removal, disassembly, and replacement of actuator/rod assembly. Can sometimes be cleaned if caught early. 3-4 hours labor.

Estimated cost: $450-750

Symptoms: Sudden misfire with loud popping or hissing sound, Check engine light with cylinder-specific misfire code, Spark plug blown completely out of head, Loss of compression on affected cylinder

Fix: 4.6L 2V engine has soft aluminum heads with shallow spark plug threads. Over-torquing or repeated removal causes thread failure. Repair involves HeliCoil or TimeSert insert. Head removal rarely needed. 2-4 hours depending on cylinder location and thread damage severity.

Estimated cost: $400-900

Typical onset: 100,000+ mi

Symptoms: Transmission fluid leaking from radiator area, Low transmission fluid level, Slipping or harsh shifts due to low fluid, Pink or red fluid puddle under vehicle

Fix: Steel cooler lines rust at crimp fittings where they connect to radiator. Quick-disconnect fittings also fail. Replace both lines as a pair with improved aftermarket lines that use compression fittings. 1.5-2.5 hours labor. Critical to catch before transmission runs low and fails.

Estimated cost: $300-550