The 2001 Discovery Series II with the 4.0L V8 is a capable off-roader plagued by catastrophic engine failures due to cylinder liner issues and chronic cooling system weaknesses. Budget heavily for major engine work or walk away.
Slipped Cylinder Liners (Engine Block Failure)
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no external leaks, Overheating despite new thermostat and water pump, Rough idle and misfires that worsen over time, Coolant contamination in oil (milky dipstick)
Fix: The Rover V8 uses pressed-in cylinder liners that slip when overheated, allowing coolant into combustion chambers. Only real fix is short block replacement or engine rebuild with top-hat liners. Expect 25-35 hours labor for engine R&R and rebuild.
Estimated cost: $4,500-8,000
Head Gasket Failure
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: External coolant leaks at block deck surface, Overheating under load or highway speeds, Bubbles in coolant reservoir, Combustion gases in cooling system (failed block test), Loss of power and rough running
Fix: Often misdiagnosed early-stage liner slip, but gaskets do fail independently. Both heads must come off (book time ~18-22 hours). Always pressure-test block for liner movement before reassembly or you'll do it twice. Include timing chain components while you're in there.
Estimated cost: $2,800-4,200
Cooling System Catastrophic Failures
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Plastic thermostat housing cracks and dumps coolant, Water pump bearing failure with grinding noise, Radiator tank separation (plastic end tanks crack), Heater core leaks soaking passenger carpet, Hose connections brittle and snap off
Fix: The entire cooling system is a time bomb of plastic components. Do it all at once: radiator, water pump, thermostat housing, all hoses, expansion tank. Heater core requires full dash removal (12-15 hours). Cooling repairs are when—not if.
Estimated cost: $1,200-2,500 (not including heater core at $1,800-2,800)
Transmission Oil Cooler Line Failure
Common · medium severityTypical onset: Any mileage—age and heat cycles
Symptoms: ATF puddle under front of vehicle, Trans temp warning light illuminates, Slipping or harsh shifts when hot, Pink milkshake in coolant if internal cooler fails
Fix: Steel lines rust through where they pass near exhaust; internal radiator cooler can also fail mixing ATF and coolant (engine killer). Replace external lines and add external trans cooler. If coolant contaminated, flush trans immediately (6-8 hours for full service and lines). NHTSA recall addressed some cooler issues but not all years.
Estimated cost: $600-1,400
Air Suspension Compressor and Bag Failures
Common · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Vehicle sags to bump stops overnight or after sitting, Compressor runs constantly with loud cycling, Suspension warning light illuminated, Uneven ride height side-to-side, Compressor thermal shutdown in hot weather
Fix: Air bags crack, compressor wears out from constant cycling, and valve block leaks. Many owners convert to coil springs ($800-1,200 kit plus 6-8 hours labor). Replacing compressor and all four bags runs similar cost but you'll do it again. Valve block rebuild adds another $400-600.
Estimated cost: $1,800-3,200 (OEM air) or $1,400-2,000 (coil conversion)
Three Amigos (ABS/TC/HDC Warning Lights)
Common · low severityTypical onset: Any mileage
Symptoms: ABS, traction control, and hill descent lights on together, No ABS function (brakes work normally otherwise), Intermittent or permanent illumination, Sometimes triggered by battery disconnect or low voltage
Fix: Usually wheel speed sensor corrosion (front sensors most common) or failing ABS shuttle valve switch. Sensor replacement is 1-2 hours per corner, shuttle valve switch is dealer part requiring shuttle valve removal (3-4 hours). Can also be wiring harness chafe. Diagnostics critical—don't parts-cannon this one.
Estimated cost: $200-800
Transfer Case Seizure and CDL Failure
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: Grinding or binding in tight turns on dry pavement, Center diff lock won't engage or disengage, Clunking from center of vehicle on deceleration, Transfer case locked in 4WD mode, Metal shavings in transfer case fluid
Fix: Viscous coupling in center diff wears and locks up, or CDL mechanism fails. Requires transfer case R&R and rebuild or replacement. Book time 8-10 hours. If driven with binding diff, can damage transmission or front diff. Regular fluid changes (every 30k) help but don't prevent forever.
Estimated cost: $2,200-3,800
Only buy if you can wrench yourself or have $5k+ set aside for inevitable engine work—these are money pits for the unprepared, but devoted off-road enthusiasts accept the trade-off for capability.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.