Vehicle & Fault Assessment
We assess symptoms, engine condition and likely failure path before recommending the next step.
/// Specialists in Jaguar Engine Replacement & Rebuilds
Mayfair Rebuilds supplies and fits tested used, reconditioned, and rebuilt Jaguar AJ20D6 3.0-litre Ingenium diesel engines across the UK mainland. Every unit is matched to your registration, built and tested in-house, and backed by up to 12 months warranty.
Factory Standard
Engine Rebuilds
Built to OE specifications
In-House Strip
Machine & Build
All work carried out in-house
Up to 12 Month
Warranty
Peace of mind guaranteed
Nationwide Collection
& Delivery
Across the UK mainland
Expert Support
Before & After Fit
Real people, real expertise
Here are the main UK faults on the 3.0-litre Jaguar AJ20D6 diesel and how Mayfair Rebuilds fixes them.
| Vehicle Problem & Fault Codes | Common UK Cause | Solution |
|---|---|---|
|
Rising oil level, turbo whine, bearing knock (P252F-00, P2463-00, P0299-00) |
Short town runs stop DPF regens and wash diesel into the sump |
JLR TOPIx Cloud (DoIP VCI) & Mitutoyo Micrometre: In-house rebuild with crank grind and new bearings |
|
Oil leak and red low oil pressure warning (P0521-00, P0524-00) |
Cracked plastic oil filter cap leaks oil and seizes crank bearings |
Digital Oil Pressure & Leak-Down Testers: Fit revised housing and tested replacement AJ20D6 unit |
|
White smoke, coolant loss, overheating (P0401-00, P2457-00, P0217-00) |
Split EGR cooler or rear plastic pipes warp the aluminium head |
Hydraulic Head Pressure Rig & Serdi Machine: Skim head, renew EGR parts, or fit reconditioned engine |
|
Front drive knock, belt snap, overheating (P0620-00, Symptom 497000) |
Heavy 48V starter-generator load loosens the A/C bracket or idler pulley |
JLR Pathfinder & Sunnen Honing Machine: Fit revised bracket, pulley, PCM update, or rebuilt AJ20D6 engine |
A clear, technician-led route from diagnosis to supply, fitment and handover for Jaguar engines.
We assess symptoms, engine condition and likely failure path before recommending the next step.
Exact engine code, platform compatibility and replacement criteria are verified for the correct fit.
We determine the right route — used, reconditioned or rebuilt — then prepare or source accordingly.
The engine is supplied, fitted, tested and handed over with aftercare guidance and support.
Technician AssessedChecked by experienced engine specialists.
Code MatchedExact engine code and platform verified for perfect fit.
Prepared to StandardEngines prepared, tested and quality assured.
Fitted & SupportedInstalled, tested and backed by aftercare support.
Direct Jaguar engine expertise, in-house rebuild standards, engine code compatibility control, supply and fit coordination, and dependable aftercare — all under one accountable team.
Specialist knowledge across Jaguar engine replacement, rebuild and diagnostics.
One team manages assessment, sourcing or rebuild route, fitment planning and handover.
Engines are prepared, rebuilt and quality-checked under workshop-controlled standards.
Engine code, platform and fitment criteria are verified before any engine is recommended.
Strip-down inspection, component replacement and machining are carried out where required.
Clear warranty-backed support and post-fit guidance for added peace of mind.
Credible UK supply channels help secure suitable donor and replacement engines.
From engine selection to installation planning, the whole route is coordinated clearly.
Verified feedback from customers who chose Mayfair Rebuilds for Land Rover engine
replacement, Range Rover engine rebuilds, Jaguar engine supply and fit, and workshop-
prepared used, rebuilt and reconditioned engines. Real vehicle references, real outcomes
and support you can trust.
Range Rover Sport 3.0 SDV6
Engine issue diagnosed properly, options explained clearly, and the replacement unit fitted without drama. Smooth service from start to finish.
Land Rover Discovery 4 3.0 TDV6
Other companies just wanted to sell an engine. Mayfair actually checked compatibility, explained the rebuild route, and delivered exactly what was promised.
Jaguar XF 2.0 Ingenium Diesel
The reconditioned engine has been faultless. Excellent communication, realistic timescales and proper aftercare once the car was back on the road.
Range Rover Velar 2.0 Ingenium
Professional workshop, clear paperwork and no hard sell. They matched the correct engine code and coordinated everything properly.
Jaguar F-PACE 3.0 Supercharged
Rare to find this level of technical knowledge and customer service together. The engine rebuild quality and handover were excellent.
Need a reliable Jaguar AJ20D6 engine for sale in the UK? Mayfair Rebuilds supplies and fits tested used, reconditioned and rebuilt Jaguar AJ20D6 engines across the UK mainland, with savings up to 40%. Every Jaguar AJ20D6 engine from us passes strict workshop checks before dispatch or fitting.
The Jaguar AJ20D6 engine is a 3.0 litre straight six Ingenium twin turbo diesel with 48V mild hybrid power. Jaguar fitted this diesel engine to F Pace D300 models from late 2020 onwards. When oil dilution, coolant leaks, or bearing wear ruins this unit, a main dealer replacement often costs over £10,000.
We have a huge stock of low mileage used and reconditioned Jaguar AJ20D6 engines. We support Jaguar drivers and local garages across England, Scotland, and Wales. Send us your vehicle registration number and a quick note on the fault. Our JLR specialist technicians check your exact engine code, year and 48V setup first. You get a fixed quote with no hidden fees, up to a 12-month warranty and support before and after fitting.
Mayfair Rebuilds gives you three clear Jaguar AJ20D6 engine options to suit your car, mileage, and repair goals. Tested used AJ20D6 engines come from verified UK donor cars and pass compression and leak-down tests before dispatch. Used units suit older cars and include a clear basic warranty.
Reconditioned Jaguar AJ20D6 engines are stripped, cleaned, and built back to OEM standards with worn parts replaced for daily high-mileage cars. Rebuilt Jaguar AJ20D6 engines go right back to the bare cylinder block for precision machining, new piston rings, bearings, gaskets, and timing chains. Your quote depends on model year, core condition, stock availability, and fitting options.
Every Jaguar AJ20D6 engine replacement at Mayfair Rebuilds follows four clear workshop steps: fault check, code check, engine preparation, and handover. Land Rover models share the AJ20D6 family code, yet the Jaguar F-Pace X761 uses its own sump, mounts, wiring harness, and turbo layout.
Our technicians check your registration, VIN, ECU, and DPF setup before any engine leaves the bench. You can buy supply only with secure pallet delivery to your own UK garage. You can also book our full supply and fit service, which covers nationwide vehicle collection, workshop fitting, fresh fluids, ECU injector coding, road testing, and handover.
Mayfair Rebuilds brings more than 25 years of hands-on Jaguar, Land Rover, and Range Rover engine experience under one roof. Our UK technicians strip, machine, build, and test every Jaguar AJ20D6 engine in-house instead of sending out unchecked stock. Every unit passes oil pressure, compression, leak-down, and dynamic tests before release.
One accountable team handles your quote, code match, build, delivery, and aftercare. Every used, reconditioned, and rebuilt engine comes with up to 12 months warranty for real confidence on the road. Enter your UK vehicle registration now for a fast, honest quote with no obligation.
Everything you need to know about our engine replacement, rebuild and supply process.