MajorVery commonSuspension

Land Rover Discovery: Air suspension compressor failure and sagging (D3/D4)

Air suspension compressor failure and sagging (D3/D4) is a very common suspension fault on the Land Rover Discovery on the 2005–2016 cars, and we rate it major. Putting it right costs $700 to $2,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 27 documented faults on the Land Rover Discovery.

Vehicle: Land Rover Discovery
Years: 2005–2016
System: Suspension

This page covers the Land Rover Discovery as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Land Rover Discovery faults27 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Air suspension strut yet. We would rather show none than show a picture of a different part.

What goes wrong

The Discovery 3/4's electronic air suspension is superb when healthy, but the Hitachi (D3) and AMK (D4) compressors wear out — piston seals and desiccant fail, the pump can't build pressure, and the car sags or refuses to rise with 'suspension fault' warnings. Height sensors and leaking air springs add to the picture on older cars. Repair kits, upgraded compressors and NZ specialist labour make this a routine but recurring cost of ownership; a car sitting low in a driveway is telling you something.

What you would notice

'Suspension fault — normal height only' message
Car sagging overnight, especially one corner
Compressor running loudly or continuously
Slow to rise to off-road height

How to check it

Where to look. Compressor under the vehicle (driver's side chassis rail), air springs at each corner, height sensors on the arms

Look at the car's stance the moment you arrive — before the seller starts it. Cycle the suspension through access, normal and off-road heights and time how long it takes (more than a minute or two to rise is suspect). Listen to the compressor under the driver's side. Spray soapy water on air spring bags to find leaks.

Parts involved: Air suspension strut.

What it costs to put right

$700 to $2,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the compressor been replaced or rebuilt, and when?”
“Does the car ever sit low after being parked overnight?”

Now check the Land Rover Discovery you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

DISCO3.CO.UK: 'How To — AMK suspension compressor replacement' (topic 84165)
K Motors 'Common Problems & Fixes — Discovery 3 & 4'
AULRO: 'D4 replacement compressor' (thread 250390)

Land Rover Discovery buyer questions

Is air suspension compressor failure and sagging (d3/d4) serious on a Land Rover Discovery?

We rate it major and very common on the Land Rover Discovery. The Discovery 3/4's electronic air suspension is superb when healthy, but the Hitachi (D3) and AMK (D4) compressors wear out — piston seals and desiccant fail, the pump can't build pressure, and the car sags or refuses to rise with 'suspension fault' warnings. Height sensors and leaking air springs add to the picture on older cars. Repair kits, upgraded compressors and NZ specialist labour make this a routine but recurring cost of ownership; a car sitting low in a driveway is telling you something.

How much does it cost to fix on a Land Rover Discovery?

$700 to $2,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Land Rover Discovery years are affected?

Our research records this fault on the 2005–2016 Land Rover Discovery. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.