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2018 Discovery Air Suspension Fault - Vehicle Sagging Overnight

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Kevin B. · rep 0 · May 22, 6:30 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery HSE Luxury

Hey everyone,

I'm having a really frustrating issue with my 2018 Land Rover Discovery HSE Luxury. Lately, I've noticed that after sitting overnight, the front end of the vehicle, sometimes even the whole car, sags significantly. When I start it up, I get a 'Suspension Fault' message on the dash, and it takes a while for the compressor to lift it back to normal height.

It seems to happen more frequently now. I've tried cycling the suspension height, and it works, but the sagging keeps coming back. The ride quality also feels a bit off, a bit bouncier than usual.

Has anyone experienced this with their Discovery? What could be causing this? Is it a common problem for these models? Any advice on what to check first would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:30 AM

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ClearTheCode admin answer:

It sounds like you're dealing with a common issue in Land Rover air suspension systems, particularly with the vehicle sagging overnight and the 'Suspension Fault' message. This typically indicates a leak in the air suspension system or a component malfunction.

Here are the common causes and what to check:

  1. Air Spring Leaks: The most frequent culprit is a leak in one or more air springs (also known as air bags). Over time, the rubber can degrade, crack, or develop small holes, allowing air to escape when the vehicle is parked. This leads to the sagging you're observing.
  2. Air Line Leaks: The plastic air lines connecting the compressor, valve block, and air springs can also develop leaks, especially where they connect to fittings.
  3. Valve Block Malfunction: The air suspension valve block controls the air distribution to each air spring. If it's faulty, it might not be holding pressure correctly, leading to air loss from specific corners or the entire system.
  4. Air Compressor Issues: While less likely to cause overnight sagging (it would usually struggle to lift the vehicle at all), a weak or failing compressor could contribute if it's working overtime to compensate for leaks, eventually leading to wear.
  5. Height Sensor Malfunction: Although not directly causing a leak, a faulty height sensor could send incorrect signals to the suspension control module, leading to improper height adjustments or fault messages.

When to see a shop:

  • Persistent Sagging: If the vehicle consistently sags overnight or after a few hours, it's crucial to have it inspected.
  • 'Suspension Fault' Message: Any persistent fault message related to the suspension should be addressed promptly.
  • Unusual Noises: Hissing sounds when the vehicle is parked might indicate an air leak.
  • Uneven Ride Height: If one corner or axle is consistently lower than the others, even after the compressor runs.

A qualified Land Rover specialist will perform a diagnostic scan (looking for codes like C1A20-64, C1A36-01, C1A00-01 related to pressure or height sensor faults), visually inspect the air springs for cracks, and use a soapy water solution to pinpoint air leaks in the lines and fittings. Addressing this early can prevent further strain on your air compressor and ensure safe driving.

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