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Mayfair Rebuilds workshop with rebuilt JLR engine

/// Specialists in Range Rover Engine Replacement & Rebuilds

Hassle Free Range Rover AJ20D6 Engine Replacement, Supply and Fit UK

Range Rover AJ20D6 engines for sale in used, reconditioned and rebuilt condition. Stripped, tested and code matched in our UK workshop, then supplied and fitted with up to 12 months warranty.

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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

Trusted By Jlr Owners Across the Uk

Land Rover
Range Rover
Jaguar

Range Rover AJ20D6 Engine Details

Engine Make : Range Rover
Engine Fuel : Diesel
Engine Horse Power : 300HP
Engine Size : 3.0
Engine Code : AJ20D6
Engine Layout : V
Engine Actual CC : 2997
Engine Cylinders : 6
Engine Valves : 24
Engine Power KW : 221 kW
Engine Fuel Supply : Direct Injection
Engine Charge : Exhaust Turbo Charger
Engine Camshaft Drive : All-wheel Drive
/// COMMON Range Rover AJ20D6 FAILURE POINTS

Common Range Rover AJ20D6 Faults and Fixes

 

Fault Seen on Codes and test Fix and parts

Cold start rattle from the bellhousing (stretched timing chain)

Range Rover L405 D350 2020-2024, Range Rover Sport L494, Defender 110 and 130

Cam and crank correlation drift, P0016 or P0017. Chain sits at the rear, so we check it with the engine or box out

Chain kit DA5198G (chains, guides, tensioners), sprocket LR125587. Scored bores or a spun bearing means a reconditioned or rebuilt AJ20D6

Rising oil level, diesel in the oil (oil dilution)

Any D300 or D350 used on short runs. Velar D300 and Discovery 5 are the worst cases

Oil quality counter past 6% triggers early "Service Required". Check fuel content in the sump

Oil and filter change at 0W-20 STJLR.03.5006, yearly or 6,000 to 8,000 miles, plus 30 minutes above 40 mph each week. We check big end and turbo bearings before we sell you a used unit

Oil leak at the turbo feed pipe

D350 engines from 2020

P0299 low boost or P0234 overboost, oil down the block face, blue smoke on overrun

New feed pipe and seals, plus the filter housing seals. We do this while the engine is out

Cracked oil filter housing

UK recall R/2024/255, AJ20-D6 and AJ20-P6 engines, build dates December 2020 to December 2023

Hot oil on the block and subframe, low level warning, no code

Housing, filter and O-rings replaced by a Land Rover dealer at no cost. We then check the belt, loom and intake for oil damage and only quote engine work if the engine ran dry

Loss of power, limp mode, melted piston crown

Discovery 5 and Range Rover Sport with blocked DPF and failed injectors

P2002 (DPF efficiency below threshold), P006B (low pressure EGR insufficient flow), P0420

Borescope on all six crowns, then a rebuilt engine if a piston or liner is damaged. We price the rebuild and a like for like swap side by side

Stalls and will not restart after stop/start

2021 Range Rover and Range Rover Sport

P0087 (fuel rail pressure too low) with a fuel pump driver module fault note

Module update or pump circuit check first. If that is the cause we say so, and no engine comes out

Chirp or squeal from the front of the engine

AJ20D6 engines noted by JLR for belt and pulley misalignment

Noise on cold start, wet weather or at idle. No fault code

Accessory belt and tensioner kit (belt kit part number to be confirmed against your VIN). Misalignment is checked before any internal work is quoted
/// Workshop-Led Process

4 Step Process to Engine Replacement

A clear, technician-led route from diagnosis to supply, fitment and handover for Range Rover engines.

01
Vehicle and fault assessment

Vehicle & Fault Assessment

We assess symptoms, engine condition and likely failure path before recommending the next step.

02
Engine code and compatibility check

Engine Code &
Compatibility Check

Exact engine code, platform compatibility and replacement criteria are verified for the correct fit.

03
Engine rebuild preparation

Rebuild / Preparation /
Sourcing Path

We determine the right route — used, reconditioned or rebuilt — then prepare or source accordingly.

04
Supply fitment and handover

Supply, Fitment &
Handover

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.

Why Choose Mayfair

Why Mayfair Is the Smarter Choice for Range Rover Engine Replacement

Direct Range Rover engine expertise, in-house rebuild standards, engine code compatibility control, supply and fit coordination, and dependable aftercare — all under one accountable team.

01

Direct Range Rover Expertise

Specialist knowledge across Range Rover engine replacement, rebuild and diagnostics.

02

One Accountable Team

One team manages assessment, sourcing or rebuild route, fitment planning and handover.

03

In-House Standards

Engines are prepared, rebuilt and quality-checked under workshop-controlled standards.

04

Code & Compatibility Control

Engine code, platform and fitment criteria are verified before any engine is recommended.

Mayfair Rebuilds Workshop-Led
Advantage
05

Rebuild Depth

Strip-down inspection, component replacement and machining are carried out where required.

06

Aftercare & Warranty

Clear warranty-backed support and post-fit guidance for added peace of mind.

07

UK Sourcing Network

Credible UK supply channels help secure suitable donor and replacement engines.

08

Supply & Fit Coordination

From engine selection to installation planning, the whole route is coordinated clearly.

Reviews & Proof

Trusted by Land Rover, Range Rover & Jaguar Owners Across the UK

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.

★ ★ ★ ★ ★
5.0 / 5 Average Customer Rating Based on verified customer reviews
JLR JLR Specialists
Workshop Prepared
UK-Wide Support
★★★★★“

Daniel M.

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.

★★★★★“

Sarah T.

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.

★★★★★“

James R.

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.

★★★★★“

Natalie P.

Range Rover Velar 2.0 Ingenium

Professional workshop, clear paperwork and no hard sell. They matched the correct engine code and coordinated everything properly.

★★★★★“

Michael C.

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.

25+ Years Experience

Specialist engine
replacement knowledge.

Warranty-Backed Support

Up to 12 months cover
for added confidence.

UK-Wide Coverage

Supply, fitment support
and nationwide reach.

Thousands Helped

Used, rebuilt and
reconditioned engines
supplied and rebuilt.

Our Workshop Gallery

JLR engine work gallery 1
JLR engine work gallery 2
JLR engine work gallery 3
JLR engine work gallery 4
JLR engine work gallery 5
JLR engine work gallery 7
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Used and Reconditioned Range Rover AJ20D6 Engine Specialists

The AJ20D6 is the 3.0 litre inline six diesel Ingenium engine that Land Rover fits to Range Rover and Range Rover Sport D300 and D350 models from 2020 onwards. It runs a 48 volt mild hybrid system, a twin scroll turbo and an electric supercharger, and it replaces the old TDV6 and SDV6 V6 units.

Mayfair Rebuilds supplies, rebuilds and replaces Range Rover AJ20D6 engines for owners across the UK. You choose a used, reconditioned or rebuilt unit. We match the engine code to your car, test it in our workshop, then supply and fit it with up to 12 months' warranty and UK mainland collection and delivery. The AJ20D6 is the 3.0 litre inline six diesel Ingenium engine that Land Rover fits to Range Rover and Range Rover Sport D300 and D350 models from 2020.

Most AJ20D6 engines that reach us do not wear out. One problem ran on too long. The timing chain sits at the back, against the gearbox, so chain work needs the engine out. Short UK runs leave diesel in the oil, and thin oil damages bearings, turbos and chains at once. We test compression, run a leak down and read the fault codes before we quote, so you know if the engine needs a repair, a rebuild or a replacement.

Which AJ20D6 Route Fits Your Range Rover

  • Used AJ20D6 engine. The cheapest fix. We source from UK donors with a known history, then clean, test and check the major parts before dispatch. It suits cars you plan to sell soon or keep for a short while.
  • Reconditioned AJ20D6 engine. Our usual pick for a daily driver with high mileage. We replace the wearing parts, reset clearances to factory figures and compression test the unit before it leaves.
  • Rebuilt AJ20D6 engine. The right route if the block, crank or heads took damage from oil starvation. Every unit is stripped to component level and machined in house.

All three routes come with supply and fit. The 48 volt system and the engine wiring must be matched to your car, so we confirm the build before we book the work. Some units reach you bare, with your turbo, injectors and loom moved over. Others arrive complete with the ancillaries already fitted, so there is no second job to book.

How the Mayfair Rebuilds Work Run, Start to Finish

  1. Fault check. You send your reg, symptoms and any codes. We judge the condition and the likely failure path.
  2. Engine code match. We confirm AJ20D6, model year and platform fitment, so the replacement drops in without electronics issues.
  3. Build or source. Reconditioned and rebuilt engines are stripped, machined and tested in house. Used units are tested before they leave.
  4. Supply, fit and handover. The engine goes in, runs on the ramp, and we talk you through servicing and warranty cover.

Get an AJ20D6 quote. Send your reg to Mayfair Rebuilds, and we will tell you what your engine needs. We check donor mileage, service history and open recalls before an engine is reserved. Clear timescales and support before and after the fit.

Frequently Asked Questions

Common Questions Answered

Everything you need to know about our engine replacement, rebuild and supply process.

It is a good engine when serviced on time and driven on longer runs. Neglected units fail early on the timing chain and bearings.
Diesel. It is the 3.0-litre inline six Ingenium diesel, fitted as D300 and D350. The petrol version is the AJ20P6.
The AJ20D4 is the 2.0-litre four-cylinder Ingenium diesel. The AJ20D6 is the 3.0-litre six-cylinder, with a 48-volt mild-hybrid system.
Range Rover and Range Rover Sport D300 and D350 models from 2020, plus Velar, Discovery and Defender six-cylinder diesels.
Timing chain rattle at the rear of the engine, oil dilution from short runs, turbo feed pipe leaks, recall R/2024/255 oil filter housing cracks, and DPF faults with codes P2002 or P0087.
Range Rover AJ20D6 engine price depends on the unit you choose. Used engines are the cheapest options. Reconditioned and rebuilt units offer long-term reliability and performance.
The chain sits at the back of the engine against the gearbox, so the engine or gearbox must come out to do the job properly.
Yes, if the block, crank and heads are undamaged. We strip, inspect and machine in house, then upgrade the wearing parts.
Land Rover quotes long intervals, but UK owners on short runs do better with a change each year or around 10,000 miles.
Every engine supplied by Mayfair Rebuilds includes up to 12 months warranty, with cover set by the route you choose.