Common Problems with the
1998–2001 Mercedes-Benz S-Class (W220)

We've identified 2 known issues that can affect the 1998–2001 Mercedes-Benz S-Class (W220). 2 of these are serious faults that could be expensive to repair.

Known Issues

Serious

Moderate

Minor

The 1998–2001 period has an average number of reported issues compared to other Mercedes-Benz S-Class (W220) year periods.

All Known Issues

Biodegradable wiring harness insulation

SeriousElectrics & Electronics

Mercedes used a soy-based wiring insulation that degrades over time, exposing bare wires and causing short circuits, random warning lights and potential fire risk. Engine bay harnesses are worst affected.

Estimated cost: £500–£2,000Affects: 1998–2005Often appears around: Age-related

Typical symptoms

•Random dashboard warning lights
•Electrical gremlins
•Engine bay burning smell

What to inspect before you buy

✓Inspect engine bay wiring for crumbling insulation
✓Check for previous harness replacement
✓Scan for stored fault codes

Airmatic suspension collapse

SeriousSuspension & Chassis

The air springs and compressor degrade with age. Cars sag overnight, ride poorly and the compressor eventually burns out if leaks are ignored.

Most affected: Models with Airmatic

Estimated cost: £800–£2,500Affects: 1998–2005Often appears around: 60,000–120,000 miles

Typical symptoms

•Car sits low after standing overnight
•Suspension warning light
•Noisy compressor

What to inspect before you buy

✓Check ride height before start-up
✓Listen for compressor running excessively
✓Inspect for oil residue around air struts

Buying Tips for the 1998 Mercedes-Benz S-Class (W220)

✓Airmatic and ABC suspension cars must sit level after 24 hours; any sag means expensive leaks.
✓Check the wiring harness in the engine bay — the biodegradable insulation crumbles with age, causing short circuits.
✓SBC brake system warning lights are common and the unit can reach its cycle limit.

2002–2005 Mercedes-Benz S-Class (W220)