Why is one corner of my Audi A8 down after it sits overnight?

Short answer: The D3 A8 rides on air suspension, with an air spring at each corner instead of steel springs. When one corner is down after the car sits for hours, the air strut at that corner is usually leaking. Owners say leaks often show up first in cold weather, and they don't fix themselves. Replacing just the leaking strut is normal; you don't have to replace them in pairs.

Symptom: After sitting overnight or for 8 hours or more, one corner (often a front) sits low, then rises after start-up. It's often worse when it's cold outside.

What to check first

1. Note which corner drops and the outside temperature. Owners say cold leaks are common below about 50°F.
2. Turn on jack mode (in the car's suspension menu) so the system stops refilling, then watch which corner drops.
3. Spray soapy water on the top and bottom of the strut and the air line fitting.
4. Make sure the compressor isn't running constantly. A big leak can wear it out.
5. Check your VIN for open recalls.

Likely causes

1. Leaking air strut (air spring). The most common cause owners report.
2. Leaking air line or fitting. Less common but cheaper.
3. Bad replacement strut. One owner's remanufactured strut leaked too.

What it usually costs

One owner said the dealer quoted $5,864, then bought rebuilt struts and a compressor for about $1,500. It still sagged, and the cause turned out to be a bad remanufactured strut.

Is it safe to keep driving?

Usually OK for short trips if it rises to normal height. If it stays low, tires can rub and handling suffers. Don't drive far until it's fixed. Verify with a mechanic.

DIY or shop?

Testing is DIY. Strut replacement is possible for experienced DIYers using jack mode and the right tools. Many owners use an Audi specialist.

Recalls, bulletins and complaints in plain words

• No air suspension recall found in NHTSA's A8 recall list for these years. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 9 keyword-matched complaints for Audi A8 and S8 2004–2010 (of 60 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-22; keywords: suspension, air spring, air strut, ride height, sag, compressor, lowered) (NHTSA returned no complaint data for 1 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Front left down when car sits at least 8 hrs or more on AudiWorld, an owner was quoted $5,864 by the dealer and instead bought rebuilt struts and a compressor for about $1,500. The car still sagged, and the cause was a bad remanufactured strut.
• In A8 air strut leaking or not? on AudiWorld, an owner's left front bottomed out in cold weather. Members said to use jack mode to test, that leaks don't get better on their own, that struts don't need to be replaced in pairs, and that cold-weather leaks below about 50°F are common.

Quick tip

With any air-suspension car, let it sit overnight and look at it in the morning before you buy it.

Vehicle focus: 2004–2010 Audi A8, A8L and S8 (D3) with air suspension.

Safety / mechanic note

A low suspension can affect handling and braking. Verify with a mechanic.