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2018 Range Rover Sport Air Suspension Fault - Sinking Overnight & 'Normal Height Only'

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Chris P. · rep 0 · May 22, 6:30 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Range Rover Sport HSE

Hey everyone,

I'm having a persistent issue with my 2018 Land Rover Range Rover Sport HSE. Lately, I've noticed that if I leave it parked overnight, especially in colder weather, the front end (sometimes the whole vehicle) seems to drop significantly. When I start it up, I get a 'Normal Height Only' message on the dash, and it takes a while for the compressor to kick in and raise the vehicle back up.

It feels like the compressor is working overtime, and sometimes it sounds a bit louder than usual. I'm worried about potential damage or if this is a sign of a bigger problem. Has anyone else experienced this with their Range Rover Sport of a similar year? What was the fix?

Any advice on what I should check or look out for before taking it to the dealership would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

This is a very common issue with Land Rover's air suspension systems, particularly as vehicles age. The 'Normal Height Only' message, combined with the vehicle sinking overnight, strongly suggests a leak in the air suspension system or a failing compressor.

Here are the common causes and what to consider:

  1. Air Leaks:

    • Air Struts/Springs: The rubber bladders on the air struts can develop cracks or small holes over time, leading to air loss. This is the most frequent culprit.
    • Air Lines: The plastic air lines connecting the components can become brittle, crack, or get damaged, causing leaks.
    • Valve Block: This component directs air to and from the individual air springs. Internal seals can fail, allowing air to escape or be misdirected.

  2. Air Suspension Compressor Issues:

    • If there's a leak, the compressor has to work harder and longer to maintain ride height. This can lead to premature wear or failure of the compressor itself. A louder-than-usual compressor often indicates it's struggling.
    • A failing compressor might not be able to generate enough pressure to lift the vehicle, especially if there's also a leak.

  3. Height Sensors: While less common for overnight sinking, faulty height sensors can sometimes give incorrect readings, leading the system to try and adjust the vehicle to an incorrect height. However, this usually presents with uneven ride height rather than a complete drop.

Relevant OBD Codes to look for:

  • C1A20: Pressure sensor fault (often related to the reservoir or compressor pressure).
  • C1A00: General air suspension system fault.
  • C1A36: Reservoir pressure fault.
  • C1A13: Pressure system fault.

When to see a shop:

Given the complexity of the air suspension system and the potential for multiple failure points, it's highly recommended to have your 2018 Range Rover Sport inspected by a qualified Land Rover specialist or dealership as soon as possible. Driving with a compromised air suspension can affect handling, braking, and overall safety. They have specialized diagnostic tools to pinpoint the exact leak location or compressor issue, ensuring the correct repair is made. Ignoring this problem can lead to further damage to the compressor or other suspension components.

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