2021 LAND ROVER DEFENDER 110

Typical onset: 15,000-50,000 mi

Symptoms: Sudden knocking or rattling from engine bay at cold start or under load, Metallic debris in oil during routine changes, Check engine light with low oil pressure codes, Catastrophic seizure in worst cases—engine stops completely

Fix: Complete engine rebuild or short block replacement required. We've seen main bearing and rod bearing failures on these early P400 engines, likely due to oiling system defects or contamination from manufacturing. Pull engine, machine crank if salvageable, replace all bearings, pistons, and rings. 25-35 hours labor plus parts. Some qualify for warranty extension, but post-warranty owners are stuck with the bill.

Estimated cost: $15,000-25,000

Typical onset: 20,000-60,000 mi

Symptoms: Transmission overheating warnings on dash, Pink or milky fluid in coolant reservoir (cooler leak causing cross-contamination), Harsh shifts or slipping, especially when towing or in hot weather, Coolant loss with no visible external leaks

Fix: Replace transmission oil cooler assembly and flush both cooling system and transmission completely to prevent downstream damage. If coolant got into trans, expect valve body or clutch pack damage requiring rebuild. Cooler replacement alone is 4-6 hours; if trans is contaminated, add 12-18 hours for rebuild. This is a known defect on ZF 8HP transmissions in these trucks.

Estimated cost: $1,800-3,500 (cooler only), $6,000-9,000 (with trans rebuild)

Typical onset: 30,000-70,000 mi

Symptoms: Clunking or thudding when shifting from park to drive or reverse, Vibration through cabin at idle or under acceleration, Visible sagging or torn rubber on mount during inspection, Excessive drivetrain movement visible when rocking vehicle in gear

Fix: Replace failed transmission mount—common on these due to weight of the powertrain and mild-hybrid system stress. Simple job: support trans with jack, unbolt mount, swap new one in. 1.5-2 hours labor. OEM mounts are expensive but necessary; aftermarket often fails faster.

Estimated cost: $450-750

Typical onset: 10,000-40,000 mi

Symptoms: Rough idle or hesitation during acceleration, Loss of power, especially under heavy throttle, Check engine light with fuel pressure codes (P0087, P0089), Hard starting after sitting overnight

Fix: Early 2020-2021 Defenders had contaminated fuel systems from manufacturing debris. Replace fuel filter (sometimes multiple filters depending on spec), inspect fuel pump and injectors for damage. Filter swap is 1-2 hours; if pump or injectors are compromised, add significant time. Land Rover issued TSBs on this—check service history.

Estimated cost: $300-600 (filter), $2,000-4,000 (if pump/injectors involved)

Symptoms: Pivi Pro screen freezes or goes black intermittently, Backup camera fails to display or shows distorted image, Climate controls unresponsive through touchscreen, Apple CarPlay/Android Auto drops connection randomly

Fix: Software-related—usually resolved with infotainment module software updates or full system resets. Dealer typically handles via Land Rover SDD diagnostics. Rarely requires hardware replacement (screen or module), but we've seen it. 0.5-1 hour labor for updates; 3-4 hours if module replacement needed.

Estimated cost: $150-250 (software update), $2,500-3,500 (module replacement)

Typical onset: 40,000-80,000 mi

Symptoms: Suspension fault warning on dash, Vehicle sits low, especially after sitting overnight, Compressor runs constantly or makes loud cycling noises, Inability to raise suspension to off-road height settings

Fix: Air suspension compressor wears out prematurely on these, especially if used in dusty or off-road conditions. Replace compressor assembly and check for air leaks in lines or bags. 3-4 hours labor. Not as bad as the P38 Range Rover days, but still a weak point.

Estimated cost: $1,800-2,800