Range Rover L405 Engine Replacement Cost: Why the Fault Matters
Range Rover L405 engine replacement cost depends heavily on what failed. A 3.0 TDV6 with a broken crankshaft, a 4.4 SDV8 with a failed timing chain, a 5.0 V8 that overheated and a P400e with a cooling fault each lead to a different scope of work and set of parts. The type of replacement unit, labour, coding and the parts renewed at fitting also matter. Because no two jobs are the same, the reliable way to find your cost is an itemised written quote after diagnosis. This guide explains how the fault shapes the job and what a fair quote should include.
How the Fault Shapes the Job
Common L405 Failures and What They Mean
Failure | Engine | What it means for the job |
| Crankshaft or bearing failure | 3.0 TDV6 / SDV6 | Debris spreads through the oil system, so the oil cooler, turbos and lines need checking or replacing. Specialists cite Land Rover's SSM 72578 on this fault |
| Timing chain failure | 4.4 SDV8 | The chains sit at the rear, so the engine must come out. Valve damage is possible if a chain jumps |
| Overheating | 5.0 V8 supercharged, and others | Head or liner damage is possible. Coolant pipes, the water pump and the radiator usually need renewing |
| Supercharger noise | 5.0 V8 supercharged | Often the isolator (JLR bulletin LTB00482NAS6) rather than engine failure, so confirm it first |
| Turbo failure | Diesels | Debris can reach the engine, so the intercooler and oil system need cleaning |
| Water pump belt fault | P400e plug-in hybrid | Covered by a recall (23V221) on some 2018–2021 PHEVs. Check before paying |
| Loss of drive power | 2020–2021 mild hybrids | May be the DC-DC converter rather than the engine (recall 26V248) |
Diagnosis must confirm which of these you have. Some symptoms that look like engine failure, such as supercharger rattle or a mild-hybrid electrical fault, are not.
Fixing the Cause So It Doesn't Happen Again
A replacement engine fitted without fixing the original cause can fail the same way. For example:
- After a bearing failure: clean or replace the oil cooler and lines, and check the turbos.
- After overheating: find and fix the leak or failed part, and renew ageing coolant pipes, hoses and the radiator where needed.
- After a turbo failure: clean the intercooler and pipework, and renew the turbo oil feed.
- After a timing chain failure: make sure the replacement unit has a new or verified chain kit, and keep to the oil-change intervals.
Before you commit, check your car by registration on the GOV.UK vehicle recall checker, because some L405 faults are covered by free recall work.
Other Cost Factors
Unit Type, Labour and Coding
Factor | Why it matters |
| Used engine | Fitted as found, so its condition depends on the donor car's history |
| Reconditioned or remanufactured engine | Prepared and rebuilt to a set specification, then tested |
| Rebuild of your own engine | Keeps the original engine number. Depends on block and crank condition |
| Engine size | The V8s and twin-turbo diesels usually take more labour |
| Ancillaries | Turbos, injectors, supercharger and sensors are reused or replaced depending on their condition |
| Coding | The engine is matched to the car's control units, with hybrid checks on the P400e and mild hybrids |
| Consumables | Fluids, filters, gaskets and mounts |
| Recovery | A non-running car has to reach the workshop |
Our Range Rover engine replacement service covers removing the failed engine, transferring ancillaries and testing the replacement, with UK collection available.
Supply and Fit, Rebuild or Repair?
- Supply and fit. A tested reconditioned or remanufactured engine matched to your L405 is fitted in place of the failed one. See our engine supply and fit service.
- Rebuild. If the block and crank can be saved, rebuilding your own engine keeps its original number. See our engine rebuild service.
- Repair. If the fault is caught early, such as a timing chain rattle, a turbo fault or a coolant leak, a targeted repair may avoid engine replacement altogether. Our engine repair service reads fault codes and physically inspects the engine before recommending any work.
Compare the total with the car's value and the condition of the gearbox, air suspension, body and electrics.
What Your Written Quote Should Show
- Diagnosis: what failed and why
- Recall check: whether any open recall applies
- Engine: the exact code and output, and whether the unit is used, reconditioned or rebuilt
- Unit history: mileage and source, or the parts replaced
- Cause fixes: oil cooler, coolant parts, turbo feed or whatever the failure requires
- Labour: removal, fitting and transfer of ancillaries
- Ancillaries: reused or replaced
- Coding and testing: ECU matching, hybrid checks, pressure test and road test
- Consumables: oil, filters, coolant, gaskets and mounts
- Extras: how further faults will be approved before any work goes ahead
- Warranty: the written terms, including mileage and conditions
- Timescale: the estimated time to source and fit
For an itemised quote for your L405, call Range Rover Garage on 01708 592377 or message us on WhatsApp on 07477 733313. Have your registration, engine code and a description of the symptoms ready.
FAQs
L405 Engine Replacement FAQs
Why don't you give a fixed price for L405 engine replacement?
The cost depends on what failed, the engine, the replacement unit and the parts needed to fix the cause. An itemised quote after diagnosis is the reliable way to find your cost.
Does a broken crankshaft always mean a new engine?
Usually it means either a full rebuild or a replacement, depending on the block's condition. Either way, the oil system and turbos must be cleaned or replaced, because debris spreads through them.
Is a rattling 5.0 V8 always a failing engine?
No. A knock or clatter at idle is often the supercharger isolator, which JLR covers in a technical bulletin. Confirm it before considering engine work.
Are any L405 engine faults covered by recalls?
Some are. They include a water pump belt fault on certain 2018–2021 PHEVs and DC-DC converter faults on some mild hybrids. Check by registration on the GOV.UK recall checker.
How long does an L405 engine replacement take?
It depends on sourcing the right unit and on what the inspection finds. Ask for an estimated timescale in your written quote.