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Land Rover · Known Issues

2018 Land Rover Discovery Problems: 4 Known Issues

2018 model year · 7,480+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 7,480+ owner reports, the 2018 Land Rover Discovery has 4 documented known issues, with 1 rated critical. The most serious is EGR Cooler Failure and Coolant Leak (TDV6/SDV6) ($2,000-$5,000 repair). The most commonly reported issue is Sunroof and A-Pillar Water Leaks with 3,200 owner reports. Across all issues with published estimates, repair costs range from $100 to $5,000. DIY maintenance guides at au7o.io.

In This Article

  • Discovery Engine2
  • Discovery Body/Panels1
  • Discovery Suspension1
  • Recalls9
  • FAQ
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In This Article

  • Engine2
  • Body/Panels1
  • Suspension1
  • Recalls9
  • FAQ

All 4 Known Issues

Filter:
ALL YEARS202520242023202220212020201920182017201620152014201320122011201020092008200720062005
Community reported
1,500 owners

On the 2010-2018 Land Rover Discovery, the EGR cooler on the 3.0L TDV6 and SDV6 diesel engines develops internal cracks that allow coolant to leak into the exhaust system. This causes white smoke from the exhaust, gradual coolant loss, and can contaminate the DPF. In the worst case, coolant enters the combustion chambers and causes hydrolock. This is considered one of the most serious diesel Discovery failures.

This issue also affects: Land Rover Range Rover, Land Rover Range Rover Sport, Jaguar XJ

Common Symptoms

  • White smoke from exhaust
  • Gradual coolant loss with no external leak
  • Sweet smell from exhaust
  • Rough running or misfires
  • Overheating
  • Milky residue in coolant overflow

How to Fix

Replace the EGR cooler with the updated JLR design. Flush the cooling system and check for coolant contamination in the intake and exhaust. Inspect the DPF for coolant damage. Some owners delete the EGR system entirely (off-road use only). Budget for 8-12 hours labor.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • LR018752 genuine left EGR valve and cooler assembly
    OEMLR018752.LRC

    Replace a pressure-test-confirmed failed left EGR cooler/valve assembly on the matching 3.0 diesel branch Fitment/availability: Left-hand 3.0 TDV6 Discovery 4/5 listing, 2009-2019 family. Confirm VIN, engine generation and supersession; …

    LR Parts

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • WarningMonitor coolant level weekly on TDV6/SDV6 models. Any unexplained coolant loss should be investigated immediately — EGR cooler failure can destroy the engine.
Typical repair cost:$2,000 - $5,000

Research This Issue

Based on 1,500 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence1,500 owner reportsLast reported by owners Dec 2025Reviewed Mar 2026
Community reported
2,100 owners

On the 2010-2020 Land Rover Discovery, diesel Discovery models suffer from DPF regeneration problems, especially when used for short journeys. The DPF becomes overloaded with soot and the active regeneration cycle cannot complete, leading to a blocked filter. Warning lights illuminate and the engine enters limp mode. Repeated failed regenerations cause the DPF to become permanently blocked, requiring expensive replacement.

This issue also affects: Land Rover Range Rover, Land Rover Range Rover Sport, Jaguar XE

Common Symptoms

  • DPF warning light on dashboard
  • Reduced engine power / limp mode
  • Increased fuel consumption during regen attempt
  • Hot exhaust smell
  • Engine fan running at high speed
  • Rough idle

How to Fix

Perform a forced DPF regeneration using JLR diagnostic equipment. If the DPF is heavily loaded but not damaged, a professional chemical clean can restore it. Replace the DPF if it is beyond cleaning. Prevent future issues by taking the vehicle on regular extended highway drives to allow passive regeneration.

Owner tips & cautions

  • WarningIf you only do short trips, a diesel Discovery is the wrong vehicle. The DPF needs at least 20 minutes of highway driving weekly to stay clean.
Typical repair cost:$300 - $3,500

Research This Issue

Based on 2,100 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence2,100 owner reportsLast reported by owners Jan 2026Reviewed Mar 2026
Community reported
3,200 owners

On the 2005-2024 Land Rover Discovery, the Discovery is notorious for water leaks through blocked sunroof drains and deteriorated A-pillar seals. Water enters the cabin through the headliner and runs down the A-pillars, pooling in the front footwells. On LR3/LR4 models, this can damage the BECM (body electronics control module) located under the driver seat. The twin sunroof design with extra-long drain tubes is particularly prone to blockage.

This issue also affects: Land Rover Discovery Sport, Land Rover Range Rover

Common Symptoms

  • Water dripping from headliner or A-pillars
  • Wet carpets in footwells after rain
  • Musty smell in cabin
  • Electrical faults from wet BECM
  • Water stains on headliner

How to Fix

Clear all four sunroof drain tubes with compressed air. Replace the A-pillar seals if worn. Apply butyl sealant around the sunroof frame. For severe cases, inspect and protect the BECM with a waterproof cover. Some owners install drain tube extensions to route water further from the body.

Owner tips & cautions

  • TipClear the sunroof drains every spring and fall. It takes 10 minutes with compressed air and prevents thousands of dollars in water damage.
Typical repair cost:$100 - $1,200

Research This Issue

Based on 3,200 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence3,200 owner reportsLast reported by owners Feb 2026Reviewed Mar 2026
Community reported
680 owners

On the 2017-2025 Land Rover Discovery, the current-generation L462 Discovery continues the air suspension tradition with its own set of issues. The ride height sensors are particularly prone to failure, giving incorrect height readings that cause the vehicle to sit at uneven heights. The sensors are located at each corner and exposed to road debris. Failure of one sensor affects the entire system's ability to level the vehicle.

This issue also affects: Jaguar XJ, Land Rover Range Rover, Land Rover Defender

Common Symptoms

  • Vehicle sitting at different heights side to side
  • Suspension fault warning
  • Ride height adjustment not working
  • Vehicle leans to one side
  • Harsh ride quality

How to Fix

Replace the faulty ride height sensor(s). These are accessible at each wheel without lifting the vehicle significantly. Recalibrate the air suspension system using JLR Pathfinder diagnostics after sensor replacement.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • LR033256 genuine front ride-height sensor
    OEMLR033256

    Replace a diagnosed front sensor on the early-VIN branch Fitment/availability: Discovery 5 L462 all models through VIN HA999999, Solihull built, front left or right; two per vehicle. Fitment/availability: Usually in supplier stock; £135.…

    Rimmer Bros
  • LR033257 genuine rear ride-height sensor
    OEMLR033257

    Replace a diagnosed rear sensor on the early-VIN branch Fitment/availability: Discovery 5 L462 all models through VIN HA999999, Solihull built, rear left or right; two per vehicle. Fitment/availability: Usually in supplier stock; £155.90…

    Rimmer Bros
  • LR098914 genuine front ride-height sensor
    OEMLR098914

    Replace a diagnosed front sensor on the later-VIN branch Fitment/availability: Discovery 5 L462 all models from VIN JA000001, Solihull built, front left or right; two per vehicle. Fitment/availability: Usually in supplier stock; £153.59 …

    Rimmer Bros
  • LR098915 genuine rear ride-height sensor
    OEMLR098915

    Replace a diagnosed rear sensor on the later-VIN branch Fitment/availability: Discovery 5 L462 from VIN JA000001, rear left or right; confirm VIN and current supersession before ordering.

    British Parts UK

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • TipThe height sensor links are cheap plastic and break easily. Keep a spare in the glovebox — a broken link gives the same symptoms as a bad sensor.
Typical repair cost:$300 - $800

Research This Issue

Based on 680 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence680 owner reportsLast reported by owners Feb 2026Reviewed Mar 2026
NHTSA Recalls9 recalls

AIR BAGS:FRONTAL

Jaguar Land Rover North America, LLC (Land Rover) is recalling certain 2020-2026 Land Rover Defender, 2021-2026 Discovery, and 2022-2026 Range Rover vehicles. The driver’s air bag clockspring connector may corrode, which can cause the air bag not to deploy as intended.

Campaign #26V38900012/06/2026

BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Jaguar Land Rover North America, LLC (Land Rover) is recalling certain 2021-2025 Land Rover Discovery vehicles. Water may not be able to drain away from the rearview camera due to insufficient drain holes, which may result in damage to the rearview camera.

Campaign #26V45800016/07/2026

ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:FILTER/SCREEN

Jaguar Land Rover North America, LLC (Land Rover) is recalling certain 2023-2024 Defender, 2024 Discovery, Range Rover, Range Rover Sport, and Range Rover Velar vehicles. The oil filter housing can crack and leak oil into the engine compartment.

Campaign #24V45000017/06/2024
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Other Land Rover Models

Land Rover Series IIA62Land Rover Series II57Land Rover Series I51Land Rover Defender44Land Rover Series III25Land Rover Range Rover Sport11

Frequently Asked Questions

What are the most common Land Rover Discovery problems?

According to Au7o's analysis of 7,480+ owner reports, the 2018 Land Rover Discovery has 4 documented issues. The most frequently reported are: EGR Cooler Failure and Coolant Leak (TDV6/SDV6), Sunroof and A-Pillar Water Leaks, Diesel Particulate Filter (DPF) Regeneration Issues. Of these, 1 is rated critical and should be addressed promptly.

Is the Land Rover Discovery reliable?

The 2018 Land Rover Discovery has 4 known issues documented across 7,480+ owner reports. 1 issue is rated critical: EGR Cooler Failure and Coolant Leak (TDV6/SDV6). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Land Rover Discovery problems?

Repair costs for known Land Rover Discovery issues range from $100 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, EGR Cooler Failure and Coolant Leak (TDV6/SDV6), typically costs $2,000-$5,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2010-2018 Land Rover Discovery EGR Cooler Failure and Coolant Leak (TDV6/SDV6)?

The EGR cooler on the 3.0L TDV6 and SDV6 diesel engines develops internal cracks that allow coolant to leak into the exhaust system. This causes white smoke from the exhaust, gradual coolant loss, and can contaminate the DPF. In the worst case, coolant enters the combustion chamb… Repairs typically run $2,000-$5,000. Severity: high.

What is the 2005-2024 Land Rover Discovery Sunroof and A-Pillar Water Leaks?

The Discovery is notorious for water leaks through blocked sunroof drains and deteriorated A-pillar seals. Water enters the cabin through the headliner and runs down the A-pillars, pooling in the front footwells. On LR3/LR4 models, this can damage the BECM (body electronics contr… Repairs typically run $100-$1,200. Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 7,480+ owner reports, NHTSA recalls, TSBs, and automotive forums.

ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER

Jaguar Land Rover North America, LLC (Land Rover) is recalling certain 2021-2024 Land Rover Range Rover Velar and Land Rover Discovery, 2020-2023 Land Rover Range Rover Evoque, 2019-2024 Land Rover Range Rover Sport, 2020-2024 Land Rover Range Rover, 2020 Land Rover Discovery Sport, 2020-2024 Land Rover Defender, 2021-2024 Jaguar F-Pace, and 2021-2022 Jaguar E-Pace mild-hybrid electric vehicles (MHEVs). Insufficient electrical load balancing during times of high demand can lead to a current overload condition and malfunction of the DCDC converter. A failure of the DC-DC converter will result in a loss of 12-Volt system charging and can lead to complete loss of drive power and exterior lighting.

Campaign #26V24800017/04/2026

ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER

Jaguar Land Rover North America, LLC (Land Rover) is recalling certain 2019-2024 Land Rover Range Rover Sport, 2020-2024 Land Rover Range Rover Evoque, Land Rover Range Rover, Land Rover Discovery Sport, Land Rover Defender, 2021-2024 Land Rover Range Rover Velar, Jaguar E-Pace, F-Pace, and Land Rover Discovery vehicles. The DC-DC converter may malfunction due to an electrical overload that can occur during high power demand. Additionally, a software error can cause the DC-DC converter to stop functioning at vehicle start-up under certain circumstances. Failure of the DC-DC converter will result in the loss of 12-Volt system charging and can lead to complete loss of drive power and exterior lighting.

Campaign #26V59900017/09/2026

+ 4 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

What is the 2010-2020 Land Rover Discovery Diesel Particulate Filter (DPF) Regeneration Issues?

Diesel Discovery models suffer from DPF regeneration problems, especially when used for short journeys. The DPF becomes overloaded with soot and the active regeneration cycle cannot complete, leading to a blocked filter. Warning lights illuminate and the engine enters limp mode. Repairs typically run $300-$3,500. Severity: medium.

What is the 2017-2025 Land Rover Discovery L462 Discovery Air Suspension Height Sensor Failure?

The current-generation L462 Discovery continues the air suspension tradition with its own set of issues. The ride height sensors are particularly prone to failure, giving incorrect height readings that cause the vehicle to sit at uneven heights. The sensors are located at each co… Repairs typically run $300-$800. Severity: medium.