This LRO reader emailed LRO.firstname.lastname@example.org to ask David Long about issues with Land Rover Discovery 2 air suspension.
When I was driving my 2004 Discovery Td5 Landmark recently, the rear air suspension went down while cruising at 60mph. I pulled over to a layby and switched off the engine. I restarted, but the suspension wouldn’t lift – I tried the body raise switch, without success.
I managed to limp the short distance back home. Next day I checked the fuse and the relay for the air suspension – everything seemed fine. I started the engine and the suspension went up, so I put it in the ‘body raised’ position and left it parked overnight.
The following morning it was still up, so I lowered it to the normal setting and I drove it to my local garage for them to investigate. I left the vehicle with them – and the suspension went down overnight. When the technicians started the engine, the suspension raised itself. They checked the air springs for leaks, and inspected the compressor and air lines. All seem fine.
When they used a diagnostic tool to see if any obvious fault showed up, the only thing that showed up was a slight variation in height sensor readings. They cleared all faults and left the Disco parked for a few hours: the suspension stayed up.
I took the Disco back home and have left it parked up on level ground. Prior to these most recent events in the past week, there have been other issues: it wouldn’t raise from the down position until the engine had been switched off and on again; and it sometimes dropped to the down position. Sometimes it stayed up for weeks; other times it would drop within minutes of being parked. I hope you can throw some light on this problem – I’m reluctant to drive very far in case it happens again.
Marshall Greer, Llanelli, Carmarthenshire
Assuming you’ve thoroughly checked the integrity of the air springs, lines and compressor, I suggest you now investigate for a possible wiring fault, as your symptoms are intermittent. Check the wiring around the plugs of the ride height sensors; corrosion can cause issues. Replace the wiring if found suspect. Check the ride-height sensors aren’t sticking or broken in the vicinity of the bottom arm.
If it occurs again and you’re able to supply a code from the diagnostic computer, that may shed a little more light on the subject.
This workshop advice appeared in the March 2016 issue of LRO. Back issues are available to download on digital devices here.