Suspension
Coil Springs
Coil springs support the vehicle weight and absorb road shocks.
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What it does
- Carry the vehicle weight
- Absorb energy from bumps
- Set the ride height
When it fails
- Car sits lower on one corner
- Clunking over bumps
- Broken coil visible
- Uneven tire wear
How to diagnose
- Inspect springs for cracks or breakage
- Compare ride height across corners
- Check for rust at the spring seat
Maintenance
- Replace springs in pairs
- Replace with correct rate and height
- Check mounts and strut bearings together
Use the diagnosis order. When a part fails, confirm each hypothesis with measurements before replacing anything — codes and symptoms overlap.
Related part
Shock Absorbers & Struts
Shock absorbers control spring movement so the tires stay in contact with the road.