EURORELIC

12 31 1 273 639 –Idler

Supersededchecked 2026-10-08source: bmwpartsdeal.commarket: US+EU

BMW part number 12 31 1 273 639 (12311273639) is the Idler, a steering part catalogued for the E21 (320, 323i, 315), E23 (728i, 728iS, 732i), E12 (518, 518i, 520), E24 (628CSi, 633CSi, 635CSi), E32 (730i, 730iL, 735i). As of our last check (2026-10-08, bmwpartsdeal.com), it has been superseded by 12317677914. Interchange records list it on E28, E30, E36, E34, Z1 as well.

⚠ Safety-critical part. Have a qualified mechanic verify fitment and installation before driving.
  1. 1 New from BMW
    Order the replacement number 12317677914
  2. 2 Aftermarket new
    No sourced aftermarket equivalent yet
  3. 3 Used / NOS
    Search live listings on eBay US/DE.
  4. 4 Interchange
    Same BMW number listed on 5 other chassis
  5. 5 Kit / reman
    None recorded yet
  6. 6 Community fix
    No forum workaround recorded yet
  7. 7 DIY guide
    No guide yet
  8. 8 Paid hunt
    We search dealers, breakers and forums for you.

Buy new

Replaced by 12317677914. Order the newer number.

  • 🇺🇸 USSupersededbmwpartsdeal.com
  • 🇪🇺 EuropeSupersededsuccessor 12317677914: Leebmann24 (DE): "3-4 Working Days" €10.7 (our Leebmann24 lookup of 2026-09-28)leebmann24.com
View 12311273639 at bmwpartsdeal.comCross-reference 12311273639 on RealOEMCatalog diagram (bmwfans.info)

Aftermarket options (0)

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.

Where to buy

Every link opens 12311273639 at that seller: “View” = the part’s own page, “Look up” = the seller’s part-number page, “Search” = the seller’s search pre-filled with the number (successor 12317677914 where shown). You can order from either region.

United States

Europe (DE · UK · DK)

“Ships internationally” is shown only where we read it on the vendor’s own shipping page (checked 2026-09-28); otherwise check with the vendor. Import duties and taxes are the buyer’s responsibility. Amazon links carry our Associates tag, so we may earn a commission; other seller links are not affiliate links today.

Supersession chain

12311273639→12317677914

Older numbers on the left, newest on the right. Numbers without a record open a lookup.

Used & NOS listings

Cross-model interchange (23)

Listed directly for E21 and E23 and E12 and E24 and E32 in our data (see Fits). Models below are other listings of the same number.

Via successor numberCatalog match (partial list)shared number 12317677914bmwfans.info

Same BMW part number, but the source list is truncated or market-specific. More models may apply.

E28
518 M10518i M10520i M20524d M21524td M21525e M20
E30
316 M10316i M10316i M40318i M10318i M40318i M42
E34
518i M40520i M20524td M21525i M20530i M30535i M30
E36
316i M40318i M40318i M42318is M42
Z1
Z1 M20

+23 more models not listed by the source.

Community fixes (0)

No forum workaround recorded yet. If you know a thread, the hunt team wants to hear about it.

Kits, reman & retrofits (0)

No kit or reman service recorded yet.

DIY

No DIY route recorded yet.

Repair guides & how-tos (0)

No repair write-up or video linked for this part yet.

Notes & sources

E21: Successor 12317677914 listed at $13.64 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation. E24: Successor 12317677914 listed at $13.64 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation. E32: Successor 12317677914 listed at $13.64 on bmwpartsdeal (InStock). E12: Successor 12317677914 listed at $13.64 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation. E23: Successor 12317677914 listed at $13.64 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation.