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2019 Q8 Air Suspension Warning and Sagging Rear

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David L. · rep 0 · May 26, 3:53 AM · 1 replies · solved · Question

Vehicle: 2019 Audi Q8 55 TFSI

Hello fellow Audi owners, I'm having a major issue with my 2019 Audi Q8 55 TFSI. For the past week, I've been getting an 'Air Suspension Malfunction' warning on my dashboard. More concerningly, the rear of the car seems to be sagging, especially overnight or after being parked for a few hours.

When I start the car, the compressor kicks in, and it usually levels out, but the warning light stays on. It feels like the ride quality is also a bit harsher than usual. I'm worried about driving it like this, especially on longer trips.

Has anyone else experienced this with their Q8 or other Audi models with air suspension? What was the cause, and how difficult/expensive was the fix? Any particular fault codes I should be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:53 AM

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ClearTheCode admin answer:

An 'Air Suspension Malfunction' warning combined with a sagging rear on your 2019 Audi Q8 is a clear indication of a problem within the adaptive air suspension system. This is a common issue across many luxury vehicles utilizing air suspension, and it requires prompt attention.

Common Causes:

  1. Air Spring Leak (Air Strut/Bag): This is the most frequent cause of sagging. Over time, the rubber air springs can develop cracks or small punctures, allowing air to escape, especially when the vehicle is parked. The rear is often affected first due to design or load.
  2. Air Line Leak: The plastic air lines connecting the compressor, valve block, and air springs can also develop leaks, though less common than air spring failures.
  3. Valve Block Malfunction: The valve block controls the air distribution to each air spring. If a valve sticks open or leaks internally, it can cause one or more corners of the vehicle to sag.
  4. Air Suspension Compressor Failure: While your compressor seems to be working (as it levels the car), a weak or failing compressor might struggle to maintain pressure or work overtime, eventually leading to complete failure. Sometimes, a compressor works hard because of a leak elsewhere.
  5. Level Sensor Fault: The height level sensors at each wheel tell the control unit the vehicle's height. A faulty sensor can give incorrect readings, leading the system to misadjust the suspension or trigger a fault.

When to See a Shop:

  • Urgent Service: Driving with a compromised air suspension can affect handling, braking, and tire wear. It's best to have it inspected by an Audi specialist as soon as possible.
  • Diagnostic Scan: A full diagnostic scan of the "Level Control" module (Module 34) is crucial. Common fault codes you might see include:
    • C104001: Air Spring Pressure Sensor - Implausible Signal (often related to leaks)
    • C103C00: Compressor Temperature Sensor - Electrical Malfunction
    • C112004: Level Sensor - Electrical Malfunction
    • C113004: Pressure Sensor for Air Suspension - Electrical Malfunction
    • C104301: Control Valve for Air Spring - Electrical Malfunction
  • Leak Detection: A technician will typically use a soapy water solution to spray suspect areas (air springs, lines, connections) to pinpoint air leaks.
  • Component Replacement: Depending on the diagnosis, replacement of the faulty air spring(s), valve block, or compressor may be necessary. These repairs can be costly, so check if your vehicle is still under an extended warranty or if Audi offers any goodwill assistance.
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