BMW S403A — Glass sunroof, electric
An electric tilt-and-slide glass sunroof.
Quick answer
S403A is BMW's factory option code for glass sunroof, electric. An electric tilt-and-slide glass sunroof.
Should you care about Glass sunroof, electric?
Pleasant, but the number-one thing to check is drainage: blocked sunroof drains cause damp footwells and electrical faults. Open it fully on the viewing and listen for slow, notchy operation.
How to tell if a BMW has S403A
- Look for
S403Aor just403on the original build sheet or window sticker. - Check the options list in the AutoTrader, eBay or dealer listing.
- Decode it from the VIN with our free BMW VIN decoder, then confirm the fitted codes in a full report.
- Where relevant, verify it physically on the car during the viewing, as described above.
Bimmer.AI is designed to help you identify BMW-specific buyer risks before you travel, negotiate, or pay for an inspection. It does not replace a physical inspection by a qualified mechanic, a legal vehicle-history check (e.g. HPI Check), or independent verification of finance, stolen, or write-off status. Repair-cost ranges are indicative UK figures that vary by region, specialist, parts supply, and labour rates.
Decode this car's full factory spec
Bimmer.AI takes the VIN and option codes and returns the decoded equipment list alongside the MOT history, known faults and a buyer verdict.
Run a Bimmer.AI report →Frequently asked questions
What does BMW option code S403A mean?
An electric tilt-and-slide glass sunroof. It sits in the comfort & convenience group of BMW's factory options.
Is Glass sunroof, electric worth having on a used BMW?
Pleasant, but the number-one thing to check is drainage: blocked sunroof drains cause damp footwells and electrical faults. Open it fully on the viewing and listen for slow, notchy operation.
How do I check if a BMW has S403A?
Look for S403A (or just 403) on the car's build sheet or in the listing's options, or decode it from the VIN. You can enter the VIN and option codes into a Bimmer.AI report to see the full decoded factory spec alongside the MOT history and known faults.