Land Rover 306DT 3.0 TDV6 Injector Problems: Symptoms & Repair (UK)

The 306DT is a PSA/Ford-developed V6 diesel used in the Discovery 4, Range Rover Sport, and Jaguar XF. It uses six Bosch piezo injectors and produces 211-275 hp. Injector replacement is expensive due to the V6 configuration and piezo technology.

Common 306DT injector failure symptoms

• V6 vibration and imbalance: Piezo injector failure causes bank-to-bank imbalance.
• Reduced power in all modes: The ECU aggressively limits power when injector deviation is detected.
• DPF overloading: Poor combustion from worn injectors accelerates DPF soot loading.

Why 306DT injectors fail

• fuel contamination
• high-pressure wear cycles
• carbon buildup
• poor fuel quality
• internal valve wear

How to diagnose 306DT injector faults

1. Read fault codes: Connect an OBD-II scanner and note any injector-related codes (P0201–P0204, P2146, P2149). This identifies which cylinder is affected.
2. Perform a leak-off test: Disconnect the fuel return pipes and route into measuring containers. Run the engine at idle for 60 seconds. Compare volumes per cylinder against manufacturer spec.
3. Listen for injector tick: Use a mechanic's stethoscope on each injector body. A dead or irregular tick indicates a stuck or failing solenoid.
4. Check fuel rail pressure: Monitor live fuel rail pressure data via diagnostic tool. Low pressure can mimic injector symptoms and may indicate a fuel pump issue instead.
5. Inspect for external leaks: Check around injector seals for signs of fuel or combustion gas leakage. Black carbon deposits indicate a blown seal.
6. Cylinder balance test: Use diagnostic software to run a cylinder contribution test. This electronically disables each injector in turn to measure its effect on engine speed.

Fault codes linked to 306DT injector issues

• P0201-P0206 – Injector circuit malfunction (cylinders 1-6)

306DT repair advice

306DT uses 6 Bosch piezo injectors — coding via SDD is mandatory. Bank 2 injectors are difficult to access. Budget 5-8 hours labour for a full set. Consider replacing in banks of 3 to manage cost.

306DT injector replacement cost (UK)

• Per injector: £180 - £350
• Full set: £700 - £1,200
• Labour: £120 - £300

Compatible injector part numbers for 306DT

• Bosch 0445116013 – Bosch piezo injector for 306DT
• Land Rover LR022335 – Land Rover OE reference

Vehicles using the 306DT engine

• Land Rover Discovery 4 (2009-2016)
• Land Rover Range Rover Sport (2013-2019)
• Land Rover Range Rover (2013-2019)
• Jaguar XF (2009-2015)

Find your exact 306DT injector by registration

Frequently asked questions

How much does 306DT TDV6 injector replacement cost?

A full set of six piezo injectors costs £1,500-£2,500. Labour is 5-8 hours. Total: £2,500-£4,000.

Are Discovery 4 and Jaguar XF 3.0D injectors the same?

Yes. Both use the 306DT engine with identical Bosch piezo injectors.

How much does it cost to replace injectors?

Replacement typically costs £150–£350 per injector depending on brand and engine. A full set of four with professional fitting usually costs £600–£1,200.

Can I drive with a faulty injector?

Driving with a faulty injector can cause engine damage, increased fuel consumption, DPF contamination, and oil dilution. We recommend diagnosis and replacement as soon as possible.

Do new injectors need coding?

Some vehicles require injector coding after replacement using manufacturer-specific diagnostic tools. Many Bosch solenoid units are plug and play. Check your engine guide for specific requirements.