2 documented faults
Air conditioning & heating
1 documented fault — symptoms, causes and workshop fixes.
Lack of or no air flow through fascia vents.
All models with climate control.
What you'd notice
Unable to switch off air flow to footwell.
The repair
AC/heater air direction flap stuck or sticking.
Workshop instructions & parts1 part
Workshop procedure
- Remove footwell heater duct.
- Ensure AC/heater air direction flap is in closed position Fig.1252797.1 .
- Fit foam pad to inside of heater housing footwell outlet Fig.1252797.2 .
- Ensure foam pad secured properly Fig.1252797.3 .
- Repeat procedure for opposite side.
- View View more information
| Part | Part number | Qty |
|---|---|---|
| Foam pad | LR149627 | 2 |
Data: Motorwise Workshop. Bulletin 1.
Other
1 documented fault — symptoms, causes and workshop fixes.
Whining noise from transfer box when driving in 3rd gear at approximately 20-30mph (30-65kph).
All models with four wheel drive.
Faulty detent pin located on transfer box.
Workshop instructions & parts1 part
Workshop procedure
- Fit new detent pin Fig.1273367.1 to transfer box.
- Tighten detent pin to 20 Nm.
- View View more information
| Part | Part number | Qty |
|---|---|---|
| Detent pin | LR178583 | 1 |
Data: Motorwise Workshop. Bulletin 2.
Take it with you
Before you view one
Land Rover Defender 3 D300 MHEV (2020–2026)
Each documented fault as a quick check for a viewing or test drive — tick them off as you go.
A little workshop vocabulary
Workshop terms used on this page
Definitions for the technical language used in these bulletins.
- Nm
- Newton-metres — the standard unit for how tightly a bolt is done up
- AC/Heater
- The heating and air-conditioning system
- Transfer Box
- The gearbox that splits drive between the front and rear axles, and selects high/low range
Common questions
Using this guide.
What are the common faults with the Land Rover Defender 3 D300 MHEV?
Garages and workshops regularly encounter two documented faults on the Land Rover Defender 3 D300 MHEV — one concerns the air conditioning and heating and one the other. Each fault above lists the symptoms, cause, fix and any parts needed.
Does every Land Rover Defender 3 D300 MHEV have these faults?
No. These are patterns documented across the model by workshops, not predictions for an individual car. Where a fault applies only to certain vehicles or VIN ranges, that is listed with the fault.
Can I check for Land Rover Defender 3 D300 MHEV faults when viewing one?
Many of them, yes — the documented symptoms are things you can see, hear or feel on a viewing or test drive. The 'Before you view one' checklist above turns each documented fault into a quick check you can tick off as you go.