2012 LAND ROVER DISCOVERY

Typical onset: 80,000-140,000 mi

Symptoms: Sudden increase in oil consumption (1+ quart per 1,000 miles), Blue smoke on cold start or under load, Knocking or rattling from lower end after initial symptoms ignored, Metal shavings in oil or complete engine seizure if driven too long

Fix: The 5.0L AJ-V8 can suffer from piston ring land cracking, especially if oil changes were neglected. Once rings fail, scoring damages cylinder walls and aluminum debris circulates, destroying rod bearings and main bearings. Repair requires full engine-out rebuild or used engine swap. Rebuild takes 25-35 hours including removal, machining, new pistons, rings, bearings, gaskets, timing components, and reassembly. Many opt for low-mileage used engine (15-20 hours swap).

Estimated cost: $8,000-15,000

Typical onset: 100,000-150,000 mi

Symptoms: Cold-start rattle from front of engine for 2-5 seconds, Check engine light with cam/crank correlation codes (P0016, P0017, P0018, P0019), Rough idle or misfires if stretched severely, Metallic rattling under acceleration

Fix: The dual-overhead-cam setup uses chains, tensioners, and plastic-backed guides that wear. If guides crack, chain can jump time and bend valves. Preventive replacement recommended around 100k. Engine-out preferred for thorough access to all four chains, guides, tensioners, and VVT components. 18-24 hours labor with engine out; some techs attempt in-chassis but risk incomplete work.

Estimated cost: $4,500-7,500

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid leak near radiator or under front of vehicle, Pink or red fluid on driveway, Transmission overheating warning on dash, Harsh shifts or slipping if fluid level drops significantly

Fix: The ZF 6HP26 transmission uses external cooler lines that corrode or crack at fittings, especially in salt-belt states. Lines run along subframe and are vulnerable to road debris. Replacement involves removing splash shields and occasionally dropping subframe for access. 3-5 hours labor, includes fresh trans fluid refill and system flush recommended.

Estimated cost: $800-1,400

Typical onset: 60,000-100,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration through floor or shifter at idle in gear, Excessive driveline movement felt during acceleration or deceleration, Visible sagging or torn rubber on mount during inspection

Fix: The rear transmission mount (crossmember mount) is fluid-filled and fails from age and stress. Rubber separates and trans drops, causing driveline angles to change. Replacement straightforward: support trans with jack, unbolt mount, swap. 1.5-2.5 hours. Often done alongside diff mounts if those are also suspect.

Estimated cost: $350-650

Typical onset: 80,000-120,000 mi

Symptoms: Hard starting, especially after sitting overnight, Rough idle or stumbling on cold start, Intermittent stalling or hesitation under load, Check engine light with fuel trim or fuel pressure codes

Fix: In-tank fuel filter screens clog from sediment, restricting flow. Low-pressure pump (lift pump) also wears out. Many owners never change fuel filter per maintenance schedule, accelerating failure. Repair requires dropping 34-gallon fuel tank (2-3 hours), replacing filter assembly and pump module. Fresh fuel recommended if tank contaminated.

Estimated cost: $900-1,600

Typical onset: 70,000-110,000 mi

Symptoms: Coolant drips from front-center of engine, passenger side, Sweet smell of coolant after driving, Overheating warning if leak progresses and coolant level drops, Visible green or orange residue on front crossmember or belly pan

Fix: Water pump (engine-driven, front of block) develops weep from seal, and plastic thermostat housing cracks at seams. Common to replace both at same time with updated parts. Water pump requires serpentine belt removal and fan clutch/shroud out of the way. 4-6 hours for pump, thermostat, hoses, and coolant refill with proper bleed procedure.

Estimated cost: $1,200-2,000