Land Rover Discovery 4 Common Problems
The Land Rover Discovery 4 is very versatile and capable off road vehicle, able to two 3.5 tonne and do the school run. However, like any vehicle with complex engineering it has its fair share of known issues. From transfer box noise to air suspension faults, Discovery 4 owners need to be aware of the common problems that can arise as their vehicles get older.
In this guide we’ll look at some of the most common Land Rover Discovery 4 problems, including air suspension, transfer box, EGR system, and the dreaded crankshaft failure. Knowing about these issues will help owners stay ahead of expensive repairs and keep their vehicles running smoothly for years to come.
Common Problems in Land Rover Discovery 4
1. Air Suspension System Issues
One of the most common issues with the Discovery 4 is the air suspension system. While this system provides excellent ride comfort and adjustability, it’s also prone to faults as the vehicle gets older.
Problems with the air suspension can manifest as unusual noises, steering wheel vibrations or uneven ride height. These symptoms can be caused by worn out air bags, failing compressors or faulty valves.
However, a faulty air suspension doesn’t just affect ride quality. It can also put extra stress on related components like the transfer box which can cause noise and decreased performance. Ignoring air suspension faults can also affect the brakes, leading to increased wear and potential safety issues.
Regular inspections and preventative maintenance, such as checking for leaks and replacing worn suspension parts, are key to keeping this system working.
2. Transfer Box Oil and Fluids
The transfer box is key to the Discovery 4’s four wheel drive system and requires clean, correctly specified fluids to function properly. Unfortunately issues with oil levels or using the wrong fluid types are not fairly common.
Low or dirty oil can cause increased friction and wear within the transfer box which can result in noise, vibration or even serious mechanical failure.
To avoid problems, Land Rover owners should follow the manufacturer’s recommended maintenance schedule for fluid changes and always use the correct oil type and quantity. Checking these fluids during every major service will go a long way to preserving the vehicle’s drivetrain.
3. Transfer Box Noise
Transfer box noise is a problem that many Discovery 4 owners will know about at some point. It can present as a whining, grinding or clunking sound—often heard during acceleration or when switching between drive modes.
The causes of this noise can be anything from worn bearings or gears inside the transfer box to misaligned or loose connections with the rear differential.
Diagnosing the cause of Land Rover D4 transfer box noise often requires a detailed inspection, starting with a check of oil levels and suspension performance. These noises are often more noticeable at low speeds, particularly when applying the brakes.
A qualified Land Rover technician may need to dismantle components to find the issue before further damage is caused.
4. Exhaust Gas Recirculation (EGR) Problems
The EGR system in the Land Rover Discovery 4 is designed to reduce emissions by recirculating exhaust gases back into the engine. While it works in theory, cracks and leaks in the EGR system are common.
When these leaks happen, it can cause reduced performance, poor fuel economy, rough idling or engine warning lights. Issues with the EGR system can also lead to high fuel consumption, which adds to the cost of repair.
Some owners choose to blank off the EGR and disable it via software tuning. But, while this will solve the problem, it’s not strictly legal and may cause your vehicle to fail emissions tests.
If you suspect an issue with your EGR it’s best to consult a Land Rover specialist, like Hofmann’s, for repair or safe modification options.
5. Crankshaft Failures
Perhaps one of the most serious issues with the Discovery 4 is crankshaft failure. A failing crankshaft can cause catastrophic engine failure and usually gives little warning before doing so. And the cost to fix is colossal requiring a brand new engine.
Some of the signs that might indicate a crankshaft problem include knocking noises from the engine, a drop in oil pressure or the engine cutting out entirely. But most of the time it’s very difficult to predict when the crankshaft is about to fail.
And it isn’t easy to prevent either. Although regular servicing, with engine oil changes and new spark plugs, can help, it isn’t a guaranteed fix.
So, if you are considering buying a second hand Land Rover Discovery 4 with high mileage that hasn’t been regularly serviced, you should be extra cautious and have the engine thoroughly inspected by a specialist.
Land Rover Recalls
The Discovery 4 has also had several official recalls. These include:
- Faulty parking brake interlock system
- Fuel leaks from the fuel pump
- Panoramic glass roof detaching
Although there has been significant uproar about the failing crankshaft issue, Land Rover has not yet accepted fault with the diesel engine used in the Discovery 4 and so has not issued any recalls or funded any repairs.
If you’re unsure if your vehicle has had its recall work done check the VIN with Land Rover or the UK’s DVSA recall database.
Land Rover Maintenance and Repair
Owning a Land Rover Discovery 4 can be a luxurious treat, especially for towing and putting to work. However, it does come with ongoing maintenance responsibilities.
Whether it’s as simple as replacing worn suspension parts and new brake pads, or more involved like servicing the transfer box or dealing with oil leaks, staying proactive is key. While some repairs can be expensive, many issues are manageable if caught early.
Budgeting for regular maintenance is part of the ownership experience. By looking after your Discovery 4 and responding to any faults, you can enjoy its luxury, performance and off-road ability for many years to come. Investing money in regular maintenance can save on costly repairs in the long run.
Need Help With Your Land Rover Discovery 4?
Our expert technicians in Henley-on-Thames, just a short drive from Oxford, are specialists in Land Rover maintenance and repair. Whether you’re experiencing transfer box noise, air suspension issues or crankshaft problems we’re here to help.
