2009 FORD EXPLORER

Typical onset: 100,000-150,000 mi

Symptoms: Rattling noise on cold start that quiets after warmup, Check engine light with cam/crank correlation codes (P0340, P0344), Sudden loss of power or no-start after noise worsens, Metal shavings in oil, low oil pressure

Fix: The plastic timing chain cassettes (guides and tensioners) disintegrate, allowing chain slap that destroys the cam phasers, scores cylinder walls, and damages pistons. By the time symptoms appear, you're usually looking at a full engine rebuild or replacement. Labor runs 18-25 hours for a proper rebuild with machine work, or 12-16 hours for a used engine swap.

Estimated cost: $4,500-7,500

Typical onset: 80,000-130,000 mi

Symptoms: Pink milkshake appearance in coolant overflow tank (trans fluid mixing with coolant), Transmission slipping, delayed engagement, or shuddering, Overheating transmission temp warnings, Coolant loss without visible external leaks

Fix: The internal trans cooler in the radiator fails, allowing coolant and ATF to mix—coolant in the trans destroys clutches and seals within days. Requires radiator replacement, transmission flush (if caught early), or full transmission rebuild if coolant contamination went unnoticed. Steel cooler lines rust through at frame brackets. Cooler line replacement is 2-3 hours, but if trans is damaged you're at 12-18 hours for a rebuild.

Estimated cost: $600-1,200 (lines/radiator only) or $3,200-5,000 (with trans rebuild)

Typical onset: 90,000-140,000 mi

Symptoms: Gear oil dripping from front of rear differential, Howling or whining noise from rear end that increases with speed, Clunking on acceleration or deceleration

Fix: Pinion seal leaks are common and cheap to fix if caught early (2 hours), but if run low on fluid, the bearings get noisy and you'll need a full differential rebuild. The 8.8-inch rear end is robust but doesn't tolerate neglect. Bearing replacement alone is 4-6 hours.

Estimated cost: $300-500 (seal only) or $1,200-1,800 (bearings/rebuild)

Typical onset: 70,000-110,000 mi

Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Uneven tire wear on inside edges, Vibration during braking

Fix: The front lower control arm bushings crack and separate, ball joints wear and develop play. Most shops replace the entire control arm assemblies rather than pressing bushings. Figure 3-4 hours labor for both sides, alignment adds another hour. Not dangerous immediately, but accelerates tire wear and steering feel degrades fast.

Estimated cost: $600-1,000

Typical onset: 60,000-120,000 mi

Symptoms: Check engine light with P2004, P2005, P2006 codes, Rough idle or hesitation during acceleration, Reduced fuel economy, Rattling from intake manifold area

Fix: The intake manifold runner control (IMRC) actuators and plates stick due to carbon buildup or actuator motor failure. Can often be cleaned and freed up without removal (1 hour), but if actuators are burnt out you're replacing the upper intake manifold assembly (3-4 hours). Not a breakdown risk but fails emissions testing in some states.

Estimated cost: $150-300 (cleaning) or $600-900 (manifold replacement)

Symptoms: Liftgate won't stay open or falls suddenly, Cracking or popping noise when opening liftgate, Visible sag or misalignment of liftgate

Fix: Liftgate support struts wear out and lose pressure, letting the heavy glass hatch drop. The hinges themselves can crack with repeated slamming. Struts are DIY-friendly (0.5 hours), hinges require two people and careful alignment (2-3 hours). Mostly an annoyance, but a falling liftgate can injure someone.

Estimated cost: $80-150 (struts) or $400-650 (hinges)