Range Rover L405 Engine Replacement Cost: Factors by Engine

Range Rover L405 engine replacement cost depends first on which engine your car has. A 3.0 V6 diesel, a 4.4 SDV8 and a 5.0 supercharged V8 each change the scope of the job. The type of unit, labour, coding and parts renewed while the engine is out shape the rest of the bill. This guide explains each factor, when a rebuild or swap makes more sense and what a written quote should include.

Range Rover L405 engine replacement cost depends first on which engine your car has. A 3.0 V6 diesel, a 4.4 SDV8 and a 5.0 supercharged V8 are very different jobs. After that come the type of replacement unit (used, reconditioned or rebuilt), the labour to remove and fit it, coding and the parts worth renewing while the engine is out. Above all, the cause of the original failure must be fixed so the new engine lasts. Because these factors vary from car to car, the reliable way to find your cost is an itemised written quote after diagnosis. This guide explains each factor so you can compare quotes fairly.

Why Your Engine Matters Most

The L405 was built from 2013 to 2021 with a wide range of engines. Each has its own weak points, its own parts and its own amount of work involved in removal and fitting. That is why one L405 replacement quote can look very different from another.

Replacement Considerations by Engine

Engine	What shapes the job
3.0 TDV6 / SDV6 diesel (306DT)	The most common L405 engine and the most common to need replacing, often after crankshaft or bearing failure. Debris from the old engine means the oil cooler, turbos and oil lines need careful attention. Twin-turbo SDV6 versions have more plumbing to transfer or renew.
4.4 SDV8 diesel (448DT)	A larger, heavier V8 with twin turbos, so removal and fitting take more work. Timing chain, injector and turbo plumbing condition all matter.
5.0 V8 supercharged (508PS)	The supercharger, intercoolers and cooling pipes in the vee add work. Coolant crossover pipe condition and supercharger health should be checked.
3.0 V6 supercharged petrol (306PS)	Less common in the UK. It has a similar supercharger-in-the-vee layout to the 5.0 V8.
P400e plug-in hybrid	The petrol engine is smaller, but the high-voltage system adds safety and specialist steps.
3.0 Ingenium six MHEV (2020–2021)	Newer engines with a 48-volt mild-hybrid system. Engines and parts are less widely available.

Confirm your exact engine code and power output before you ask for quotes. Our Range Rover L405 engine page lists the engines we cover.

The Main Cost Factors

Unit Type, Labour and Coding

Type of replacement unit. A used engine is fitted as found, so its condition depends on the donor car's history. A reconditioned engine has been prepared and rebuilt to a set specification. A rebuild of your own engine keeps its original engine number. Each one involves a different amount of work and carries a different level of certainty.

Labour. Removal and refitting, transferring serviceable ancillaries, refilling fluids and testing all take workshop time. The heavier V8s and the more complex twin-turbo and supercharged engines usually take longer.

Coding and software. The replacement must be matched to the car's control units. Our engine replacement process includes engine code identification at the start and software coding and ECU synchronisation at the end, followed by a cooling system pressure test and a road test.

Recovery. A non-running L405 has to reach the workshop, which adds to the total.

Parts to Renew While the Engine Is Out

With the engine out, many parts are easier to reach than they will be for years. Some must be replaced because the old engine's failure has contaminated them. Others are sensible to renew at the same time:

Part	Why it matters
Oil cooler and oil lines	Debris from a bearing failure can stay inside and damage the new engine
Turbos (diesels)	They share the contaminated oil supply, so check them or replace them
Radiator and coolant hoses	Coolant contamination or ageing hoses can cause early problems
Engine mounts	Easier to renew with the engine out
EGR, DPF and intake	Carbon and blockages can hurt the new engine's performance
Supercharger and coolant pipes (petrol V8)	Known weak points sitting directly in the vee
Fluids, filters and gaskets	Always renewed

Every extra part raises the quote, but leaving out contaminated or worn parts can shorten the new engine's life. Ask the workshop to explain which items are essential and which are optional.

Replace, Rebuild or Swap?

A replacement is not always the right answer:

Repair suits a specific fault caught early, such as a timing chain, turbo or a leak, before internal damage occurs.
Rebuild suits an engine whose block, head and crank are serviceable. Our engine rebuild service covers a full strip-down, measurement and new wear parts.
Replacement suits an engine damaged beyond economical rebuild, or a case where downtime matters.
Engine swap means fitting a different or upgraded engine. Our engine swap service covers like-for-like and performance swaps. If the engine type, cylinder capacity or fuel type changes, GOV.UK says the V5C must be updated, and you should inform your insurer.

Before committing, compare the total cost with the car's value and the condition of the rest of the car, including the gearbox, air suspension and body.

What Your Written Quote Should Show

Ask each workshop for the same items in writing:

Diagnosis: what failed and why
Engine: the exact engine code and output, and whether the unit is used, reconditioned or rebuilt
Unit history: mileage and source for a used unit, or the parts replaced for a reconditioned one
Labour: removal, fitting and transfer of ancillaries
Ancillaries: which are reused and which are replaced
Oil system: oil cooler, lines and turbo feed after a debris failure
Cooling system: radiator, hoses and, on petrol V8s, crossover pipes
Consumables: oil, filters, coolant, gaskets and mounts
Coding and testing: ECU matching, pressure test and road test
Extras: how extra faults found during the job will be approved
Warranty: the written terms, including mileage and conditions
Timescale: the estimated time to source and fit the engine

For an itemised quote for your L405, use our get a quote page or call 01375 531355. Have your registration, engine code and a description of the symptoms ready.

FAQs

L405 Engine Replacement FAQs

Why don't you publish a fixed price for L405 engine replacement?
The cost depends on the engine, the replacement unit, the cause of failure and the parts found during the job. A fixed figure would be wrong for many cars, so an itemised quote after diagnosis is the reliable way to find your cost.

Is it worth replacing the engine in an L405?
That depends on the car's value, its overall condition and how long you plan to keep it. If the body, gearbox and suspension are sound, a replacement or rebuild can make sense. Compare the full quote with the car's value.

Can I fit an SDV8 in place of a failed 3.0 V6 diesel?
It is technically an engine swap, not a like-for-like replacement, so it needs extra planning, parts and coding. The V5C would need updating, and you would need to tell your insurer. Ask for a detailed assessment first.

Is a reconditioned engine better than a used one?
A reconditioned engine has known work behind it, while a used engine's condition depends on its history. Ask for documentation either way.

How long does an L405 engine replacement take?
It depends on how quickly a suitable unit can be sourced and what the inspection finds. Ask for an estimated timescale in your written quote.