2010 LAND ROVER DISCOVERY

Typical onset: 80,000-150,000 mi

Symptoms: White smoke from exhaust on cold start that clears after warmup, Rapid coolant loss with no visible external leaks, Rough idle or misfire codes, often cylinder 3 or 7, Milky oil or coolant in oil pan during changes, Hydrolock and catastrophic failure if driven aggressively with flooded cylinder

Fix: This is the notorious AJ-V8 porous block issue where coolant seeps past liner o-rings into cylinders. Proper fix requires engine removal, full teardown, liner replacement or re-seal with updated gaskets, and machine work. Some shops attempt head gasket replacement as a Band-Aid (12-16 hours labor), but full rebuild is the real solution (40-60 hours). Many engines are replaced with used or remanufactured units instead.

Estimated cost: $8,000-15,000

Typical onset: 60,000-120,000 mi

Symptoms: Transmission slipping, delayed engagement, or harsh shifts, Milkshake appearance in transmission fluid (coolant mixing), Check engine light with transmission-related codes, Transmission overheating warnings on dash, Complete transmission failure if cooler breach goes undetected

Fix: The ZF 6HP26/28 transmission's internal oil cooler can rupture, allowing coolant and ATF to mix—this destroys the transmission within miles if not caught immediately. Requires transmission removal, complete rebuild or replacement, new cooler, and thorough flushing of cooling system. External cooler upgrade highly recommended during repair. Trans R&R is 8-10 hours, rebuild adds 15-20 hours, or replacement unit 10-12 hours total.

Estimated cost: $4,500-8,000

Typical onset: 100,000-150,000 mi

Symptoms: Cold-start rattle from front of engine (first 3-5 seconds), Metallic ticking or whirring noise at idle, Check engine light with cam/crank correlation codes, Loss of power or rough running if chain has jumped

Fix: The 5.0L AJ-V8 uses hydraulic tensioners that wear, allowing chain slap against guides. If ignored, chain can jump timing and cause valve-to-piston contact. Requires front cover removal, both timing chains, tensioners, guides, and variable valve timing components. Critical to address at first sign of noise. 18-24 hours labor including water pump replacement while in there.

Estimated cost: $3,500-5,500

Typical onset: 70,000-110,000 mi

Symptoms: Vehicle sagging at one or more corners after sitting overnight, Suspension fault warning on dash with restricted ride height, Compressor running excessively or constantly, Hissing sound from suspension corners, Inability to raise to off-road height

Fix: Air springs develop leaks at folds or mounting points; compressor burns out from overwork trying to maintain pressure. Rear bags fail more frequently than fronts. Single bag replacement is 2-3 hours each corner, compressor is 3-4 hours. Many owners convert to coil springs ($1,500-2,000) to eliminate chronic issues, though this affects off-road capability.

Estimated cost: $800-1,500 per corner; $1,200-1,800 compressor

Typical onset: 60,000-100,000 mi

Symptoms: Coolant puddles under front of vehicle, Sweet coolant smell in cabin with heat on, Overheating or temperature fluctuations, Visible coolant seepage from front timing cover area, Low coolant warning light

Fix: Water pump weeps from seal or housing cracks; plastic thermostat housing becomes brittle and cracks at mounting points. Water pump requires partial timing cover removal (8-10 hours), so always replace thermostat housing, hoses, and coolant at same time. If doing timing chains, this is included in that job.

Estimated cost: $1,200-2,000

Typical onset: 80,000-130,000 mi

Symptoms: Clunking from rear on acceleration or deceleration, Vibration through chassis at highway speeds, Visible differential movement or sag when rocking vehicle, Uneven tire wear on rear, Transmission mount failure often accompanies this

Fix: The rear differential is mounted with large rubber bushings that tear from the weight and torque. Transmission mount also fails frequently, causing excessive driveline movement. Diff bushing replacement requires subframe drop or specialized tools (6-8 hours), trans mount is 2-3 hours. Do both together if either shows wear.

Estimated cost: $1,200-2,200 for both

Typical onset: 90,000-140,000 mi

Symptoms: Rough idle or misfires, especially when hot, Hard starting or extended cranking, Fuel smell or visible leaks at injector rail, Loss of power under load, Multiple misfire codes or fuel trim codes

Fix: Direct injection system develops injector failures or high-pressure pump issues. Injectors can leak externally or fail internally. Single injector is 2-3 hours, all eight is 8-10 hours. High-pressure fuel pump (driven off camshaft) is 4-5 hours. Always replace fuel filter (annoyingly difficult access, 1.5 hours) during any fuel system work.

Estimated cost: $600-1,000 per injector; $1,500-2,200 HP pump