Smart #3 HX21 Door Lock
New, used, or aftermarket – from sellers across Europe.
Parts availability
Hard to find – this is exactly what hank is made for!
Widely available Limited Hard to find
Last updated: 08.08.2026, 00:05
Door Lock for your Smart #3?
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Find Smart #3 HX21 parts online
hank's free AI report searches specialized shops for Smart #3 HX21 parts, including partsformercedes-benz.com, PostWar Classic & techniczentrum.
About this part
Door locks on your #3 HX21 secure your vehicle via the central locking system, key fob and immobiliser. A faulty lock that won't engage or release properly compromises your vehicle's security.
Frequently asked questions
What should I check when ordering a replacement door lock for the Smart #3?
Confirm the door position (front/rear, left/right) on your #3 HX21 and whether you need just the lock actuator or the complete lock assembly including the cylinder.
Can I replace just the lock actuator?
On most vehicles yes – the actuator motor can be replaced without changing the entire lock. This is often the more affordable fix when the mechanical lock still works.
Why hank?
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