Expert rebuilds for every Discovery 5 - from D200, D300, P400. In-house, OEM-spec, 12-month warranty.
Discovery 5 Engine • In-House Rebuild
Discovery 5 Engine Replacement
At JLR Engine Specialists Ltd, every Discovery 5 engine is rebuilt in our dedicated workshop using only Land Rover-approved components. With over 190 Discovery 5 engines restored since 2017, we provide transparent, all-in pricing and a 12-month unlimited mileage warranty - backed by our specialist team.
Common Discovery 5 Engine Problems
These are the most frequent Discovery 5 engine issues we diagnose and repair in our workshop. Our solutions address the root cause, not just the symptoms.
| Symptom | Likely Cause | Our Solution |
|---|---|---|
| Limp mode on motorway | P400 turbo actuator failure (LR072310) | Genuine updated actuator + ECU recalibration |
| Coolant warning light | D200/D300 EGR cooler leak | Remanufactured EGR cooler + full system flush |
| Rough idle after short trips | Particulate filter clogging | Full DPF regeneration + software update |
| MHEV system fault | 48V battery degradation under load | Battery health check + 48V system diagnostics |
Why Choose JLR Engine Specialists Workshop?
We’re a specialist JLR engine workshop - not a broker or general garage. Every Discovery 5 engine is rebuilt in-house by our technicians, using only OEM-spec or premium aftermarket parts (Mahle, Elring, Land Rover).
Our service includes:
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Full strip-down and precision metrology
Identify root cause - whether it's turbo actuator, EGR cooler, or MHEV system issues.
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Diagnostics with Autologic and JLR SDD tools
Accurate fault-finding using the latest JLR diagnostic equipment for modern engines.
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ECU adaptation for MHEV and mild-hybrid systems
Proper integration and calibration of 48V hybrid systems post-rebuild.
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12-month unlimited mileage warranty
Issued directly by us - no third-party complications.
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UK-wide vehicle collection
Since 2009, we’ve helped family owners, luxury SUV drivers, and tech-focused buyers restore reliability - with no hidden diagnostics fees if you proceed.
Our In-House Rebuild Process
Every Discovery 5 engine undergoes our 5-step rebuild process:
Diagnosis
Scan for MHEV faults, turbo actuator codes, EGR errors
Comprehensive Testing
- Advanced diagnostic scanners
- Compression testing equipment
- Borescope inspection cameras
Metrology
Measure cylinder wear, bearing clearances (<0.05mm tolerance)
Precision Standards
- Measure crankshaft runout (<0.05mm)
- Head flatness for MLS gasket integrity
- Cylinder bore taper measurement
Machining
Block honing, head skimming - all done on-site
On-Site Facilities
- CNC cylinder head skimming
- Pressure testing up to 30 bar
- Plateau honing equipment
Upgrades
P400 → updated turbo actuator; D300 → reinforced EGR cooler
Common Upgrades
- TD5 → waterproof loom
- Puma → silicone hoses
- 300Tdi → ARP head studs
Validation
45-minute dyno run + 15-mile loaded road test (motorway simulation)
Testing Protocol
- 45-minute dyno run (oil pressure ≥4 bar at idle)
- 15-mile loaded road test
- Coolant and oil temperature monitoring
Diagnosis
Scan for MHEV faults, turbo actuator codes, EGR errors
Comprehensive Testing
- Advanced diagnostic scanners
- Compression testing equipment
- Borescope inspection cameras
Metrology
Measure cylinder wear, bearing clearances (<0.05mm tolerance)
Precision Standards
- Measure crankshaft runout (<0.05mm)
- Head flatness for MLS gasket integrity
- Cylinder bore taper measurement
Machining
Block honing, head skimming - all done on-site
On-Site Facilities
- CNC cylinder head skimming
- Pressure testing up to 30 bar
- Plateau honing equipment
Upgrades
P400 → updated turbo actuator; D300 → reinforced EGR cooler
Common Upgrades
- TD5 → waterproof loom
- Puma → silicone hoses
- 300Tdi → ARP head studs
Validation
45-minute dyno run + 15-mile loaded road test (motorway simulation)
Testing Protocol
- 45-minute dyno run (oil pressure ≥4 bar at idle)
- 15-mile loaded road test
- Coolant and oil temperature monitoring
Engine Deep Dives
Detailed breakdown of each Defender Hard Top engine we rebuild, with our specialist approach to common issues.
D200 (2017–Present) – The Efficient Family Choice
D300 (2017–Present) – Towing & Torque
P400 (2017–Present) – Balanced Performance
Family & Luxury Use
The Discovery 5 blends cutting-edge tech with seven-seat practicality
We tailor rebuilds for:
Our Engine Specialties:
- P400 turbo actuator updates
- D300 MHEV diagnostics
- Full ECU integration & coding
- DPF management systems
- Towing package validation
Rebuilt vs. Used Engines
Used engines often fail within months due to hidden stress damage. Our rebuilt units include:
Used Engine Risks
- Hidden stress damage
- Fail within months
- Short-term fix only
- No warranty or limited coverage
- £6,000 "bargain" that fails during a family holiday
Our Rebuilt Engines
- Full disassembly and inspection
- OEM-spec components
- 12-month unlimited mileage warranty
- No hidden diagnostics fees if you proceed
- Address P400 & D300 specific systems
Service Coverage
We offer UK-wide vehicle collection and specialise in Discovery 5 family, luxury, and towing builds.
Click on any location to visit our dedicated service page for that area.