EURORELIC

13 62 1 733 678 –Mass air flow sensor (BOSCH)

Supersededchecked 2026-10-08source: bmwpartsdeal.commarket: US (EU: not orderable)

BMW part number 13 62 1 733 678 (13621733678) is the Mass air flow sensor (BOSCH), a fuel part catalogued for the E32 (750i, 750iL, 750iLS), E34 (520i), E31 (850Ci). As of our last check (2026-10-08, bmwpartsdeal.com), it has been superseded by 13627527525. Interchange records list it on E36 as well. 1 repair guide below.

⚠ Safety-critical part. Have a qualified mechanic verify fitment and installation before driving.
  1. 1 New from BMW
    Order the replacement number 13627527525
  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 1 other chassis
  5. 5 Kit / reman
    None recorded yet
  6. 6 Community fix
    No forum workaround recorded yet
  7. 7 DIY guide
    1 repair how-to linked (forum, article, video)
  8. 8 Paid hunt
    We search dealers, breakers and forums for you.

Buy new

Replaced by 13627527525. Order the newer number.

  • 🇺🇸 USSupersededbmwpartsdeal.com
  • 🇪🇺 EuropeNLA newsuccessor 13627527525: Leebmann24 (DE): "Not available" (our Leebmann24 lookup of 2026-09-28)leebmann24.com
View 13621733678 at bmwpartsdeal.comCross-reference 13621733678 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 13621733678 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 13627527525 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

13621733678→13627527525

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

Used & NOS listings

Cross-model interchange (1)

Listed directly for E32 and E34 and E31 in our data (see Fits). Models below are other listings of the same number.

Via successor numberCatalog matchshared number 13627527525bmwfans.info

Same BMW part number listed for this model in catalog data. Not a physical fit test.

E36
320i M50

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 (1)

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. Safety-critical part: have a qualified mechanic check the work.

ArticleShiftBMWDifficulty: Mediumwritten for E31 / E32

MAF Troubleshooting M70 (V12) ↗

The author spent a long time chasing hesitation, hunting idle and stalling on both V12 banks: vacuum leaks, fuel pressure regulators and pumps all came back clean. Swapping in replacement mass air flow sensors finally cured it. A good checklist before condemning other parts.

Tools mentioned: Basic hand tools, multimeter

Diagnosis story; the fix was replacing the MAFs.

by Sean · shiftbmw.com· link checked 2026-10-08

Notes & sources

E34: Successor 13627527525 listed at $1679.94 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel): have a qualified mechanic verify fitment and installation. E31: Successor 13627527525 listed at $1679.94 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation. E32: Successor 13627527525 listed at $1679.94 on bmwpartsdeal (InStock). SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation.