BMW part number 51 21 9 556 311 (51219556311) is the Rep.kit f lock cylinder (*CODE 5000), a body part catalogued for the E21 (320, 323i, 315). As of our last check (2026-10-07, bmwpartsdeal.com), BMW lists it as no longer available new (NLA). 2 repair guides below.
Not available new according to the status source (US checked). NLA can be market-specific, so try the other region below.
No sourced aftermarket equivalent recorded yet. We only list brand numbers that a brand catalog or vendor page explicitly cross-references to this BMW number.
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No interchange recorded. That doesn't prove there isn't one; it means we have no sourced match yet.
No forum workaround recorded yet. If you know a thread, the hunt team wants to hear about it.
No kit or reman service recorded yet.
No DIY route recorded yet.
Write-ups and videos from owners, forums and specialists on removing and fitting this part. Summaries are ours; follow the link for the full steps, photos and torque values, and credit goes to the original author.
With the door panel off, it shows how to read the key code stamped on the cylinder (a new key cut to code may be all you need) and how to remove and refit the door lock cylinder when the lock itself is at fault.
Tools mentioned: Screwdrivers, small mirror, flashlight
Fixes a door lock whose key won't turn, keeping the original key: pry off the outer cap and return spring, slide out the core and find the lock plates that don't spring back, then replace their tiny springs one plate at a time so the order isn't mixed up. Done on an '83 320is; applies to all E21s.
Tools mentioned: Small flat screwdriver, pliers, very fine pick, replacement springs from a locksmith
Last listed $21.39 on bmwpartsdeal (not orderable).
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