BMW S302A — Alarm system
Factory anti-theft alarm with interior movement sensing.
Quick answer
S302A is BMW's factory option code for alarm system. Factory anti-theft alarm with interior movement sensing.
Should you care about Alarm system?
Nice to have and can help insurance. A flat siren back-up battery is a common, cheap fault on older cars.
How to tell if a BMW has S302A
- Look for
S302Aor just302on 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 S302A mean?
Factory anti-theft alarm with interior movement sensing. It sits in the safety & security group of BMW's factory options.
Is Alarm system worth having on a used BMW?
Nice to have and can help insurance. A flat siren back-up battery is a common, cheap fault on older cars.
How do I check if a BMW has S302A?
Look for S302A (or just 302) 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.