Land Rover Range Rover: Air suspension — compressor thermal cutout, air spring seep and slow rise

Every L405 rides on four-corner air suspension, and it is the system most likely to cost the next owner money. Age gets it in three places at once: the rubber air springs develop a slow seep, the compressor then runs far more often than it was designed to and overheats into a thermal cutout, and the corner valve block or a height sensor eventually joins in. The pattern owners describe is a car that settles overnight and takes an unusually long time to lift in the morning, or a 'suspension inactive' style message that appears and then clears. It rarely strands you immediately, but a compressor that has been working against a leaking spring for months is a compressor that is already worn out, so the bill grows the longer it is ignored — and a car parked at an even height for a viewing tells you nothing at all.

• Car sitting low, or lower at one corner, after being parked overnight
• Slow to rise on start-up, or not rising to the selected height
• Suspension warning message on the dash, sometimes clearing by itself
• Compressor running far longer or more often than expected
• Ride height changing on its own, or access height not working

The most valuable check is the one you cannot do at a scheduled viewing: see the car after it has sat overnight, unstarted, and look at it before the engine is turned on. On level ground, compare the gap between each tyre and its arch — all four should be even, and one corner sitting noticeably lower is the giveaway. This matters because the system lifts the car within a minute of starting and hides the fault completely, so a car that is already running when you arrive has told you nothing. With the engine started, watch how long it takes to come up to normal height and listen for the compressor running on and on rather than stopping. Cycle through the height settings and confirm the car actually moves to each one. Watch the dash for any suspension message during the whole visit. On the drive, listen for a hiss from any corner and note whether the car feels level. Ask the seller how often it has needed suspension work — on this vehicle almost every honest answer is 'at least once'. If a workshop inspection is possible: have the system checked for stored suspension codes and the compressor run time assessed.

Parts involved: Air suspension strut.

$900 to $5,500 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.

• “Does it sit level after being parked overnight, and can I see it before it is started?”
• “Have any air springs or the compressor ever been replaced?”
• “Has a suspension warning message ever appeared?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.