The 3.6-litre TDV8 – known as the 368DT – is a powerful engine, but its twin-turbo setup and piezo injectors are prone to wear, carbon buildup, and electrical failure. When they go wrong, you lose power, economy, and potentially the whole engine. This guide covers the symptoms, causes, diagnostic steps, and the honest decision framework for repair or replacement.
Turbocharger and injector failure on the 368DT TDV8 is a common cause of power loss, excessive smoke, and poor fuel economy. The variable-geometry turbo actuators seize or the piezo injectors become clogged or electrically faulty. Repair costs vary – a turbo rebuild or replacement can be £1,000–£2,500, while a full set of injectors is £1,200–£2,000 plus labour. Catching it early prevents secondary damage to the DPF and catalytic converter.
If your 368DT is smoking, lacks power, or has a lumpy idle, get the turbo and injectors checked immediately – a simple diagnostic scan will often point to the culprit.
Turbo and injector issues rarely appear overnight. Here's what you'll typically experience, from the first hint to a full breakdown.
If you notice any of these, don't ignore them. A failing injector can wash the cylinder bores and dilute the oil, leading to catastrophic engine failure. For more on turbo issues, see our turbocharger failure guide.
The 368DT is a 3.6‑litre V8 twin‑turbo diesel. While robust, its common‑rail injection and variable‑geometry turbo are sensitive to oil quality, fuel contamination, and carbon buildup. The primary failure modes are:
The most common culprit is the turbo actuator – a replacement often cures boost issues. Injector problems usually require coding after replacement. For a detailed breakdown of the 368DT, see our 368DT Knowledge Centre.
The 368DT was fitted to several Land Rover models from the late 2000s to early 2010s. The table below shows the most common applications.
| Model | Chassis | Years | Risk Level |
|---|---|---|---|
| Range Rover (L322) | TDV8 | 2006–2010 | Critical — early turbos and injectors prone to failure |
| Range Rover Sport (L320) | TDV8 | 2006–2013 | High — same engine as L322 |
| Discovery 4 (L319) | TDV8 (late) | 2009–2016 | Medium — later revisions have improved actuator design |
The 368DT is less common than the 3.0‑litre SDV6, but it has a loyal following. For a full list of engine options, see our Engine Failure Index 2026.
Regular oil changes (every 6,000–8,000 miles) with the correct spec (5W‑30 or 0W‑30) keep turbo bearings and actuators clean. Extended intervals allow sludge to form.
Using premium diesel with higher cetane and detergent additives reduces injector deposits. Avoid supermarket fuel if possible.
Short trips prevent the engine from reaching operating temperature, leading to carbon buildup and DPF sooting. Regular motorway runs help burn off deposits.
Good maintenance is the best prevention. For specific oil recommendations, see our engine oil technical reference.
Diagnosing these issues requires a combination of scanning, live data, and physical inspection. A good specialist will follow this sequence.
Using a Land Rover‑compatible tool, the specialist reads fault codes. Common ones include P0234 (turbo overboost), P0299 (underboost), P0263–P0272 (injector cylinder balance), and P0401 (EGR, often linked).
With the engine running, the technician monitors boost pressure (actual vs. requested), injector correction values, and fuel rail pressure. Deviations point to the faulty component.
The actuator can be commanded to move via the diagnostic tool. If it fails to respond or sticks, the turbo needs attention.
A leak‑off test measures the amount of fuel returning from each injector. Excessive return indicates a worn injector. This is a simple and accurate test.
Cutting open the oil filter can reveal metal particles from turbo bearing wear. The fuel filter may show signs of contamination or water.
If you suspect a problem, our Diagnostic Wizard can help narrow down the cause. Always use a specialist with Land Rover diagnostics.
The cost of repair depends on how quickly you act. Here's what you can expect across the main components.
| Stage | Used (Supply Only) | Reconditioned (Supply Only) | Rebuilt (Supply Only) | Main Dealer Est. |
|---|---|---|---|---|
| Turbo Actuator Only | £150–£300 [ESTIMATED] | £300–£600 [EM-QUOTE] | £400–£700 [ESTIMATED] | £500–£900 |
| Turbocharger Replacement (Exchange) | £800–£1,500 [ESTIMATED] | £1,200–£2,200 [EM-QUOTE] | £1,500–£2,800 [ESTIMATED] | £2,000–£3,500 |
| Full Set of Injectors (8) + Coding | £600–£1,200 [ESTIMATED] | £1,000–£1,800 [EM-QUOTE] | £1,200–£2,200 [ESTIMATED] | £1,800–£3,000 |
| Turbo + Injectors + DPF / Cat | £2,000–£3,500 [ESTIMATED] | £3,500–£5,500 [EM-QUOTE] | £4,500–£7,000 [ESTIMATED] | £5,000–£9,000 |
Labour for a turbo replacement is typically 6–10 hours, while injector replacement adds another 4–6 hours. Always ask for a quote that includes recalibration and a new DPF if needed. For more detailed cost breakdowns, see our replacement cost by engine page.
Prevention is always cheaper than a turbo rebuild. Here's how to protect your 368DT.
Prevention is much cheaper than repair. For model‑specific service schedules, see our Range Rover service schedule.
🔴 Immediate — repair the turbo or injectors before they cause catastrophic damage.
A turbo replacement is expensive but often less than 40% of the vehicle's value. However, if you ignore the symptoms and the turbo disintegrates, debris can destroy the engine. Similarly, a leaking injector can wash the cylinder bores and dilute the oil, leading to a bottom‑end failure. Don't delay. See the full economics framework for a worked example.
If you're still uncertain, compare this failure to the turbocharger failure or read real owner decisions in our case studies section.
A loss of power, a whining or grinding noise, and black smoke under acceleration are the early warnings. A check engine light with P0299 (underboost) or P0234 (overboost) is also common.
It is strongly advised against. A faulty injector can wash the cylinder bore, dilute the oil, and cause catastrophic engine failure. A failing turbo can disintegrate and send debris through the engine. Have it towed to a specialist.
At an independent specialist, expect £1,200–£2,200 [EM-QUOTE] for a reconditioned turbo (supply only) plus 6–10 hours labour. Main dealer prices are significantly higher.
Yes – a fresh set of injectors restores fuel economy, power, and reduces DPF regens. If the rest of the vehicle is in good condition, it's a worthwhile investment.
Soot and carbon buildup from the EGR and DPF systems accumulate on the variable‑vane mechanism. Regular motorway driving and using premium fuel can help prevent this.
Land Rover has issued some TSBs for the 368DT, but no major recalls. Check with your dealer using your VIN to see if any apply.
Ready to get a quote for a 368DT turbo or injector repair? Compare prices from vetted specialists.