Skip to content
FREE SHIPPING on US orders over $75 (oversize excepted) • Quality used E36 & E46 parts • Every part inspected & graded
Genuine BMW
BMW Part Number12 31 7 505 923

Cap

Out of stock

One email when it is listed. Nothing else.

Free US shipping on orders over $75.00 · oversize quoted. Oversize items ship at a flat $49.99 each — free shipping does not cover them.

WARNING: Cancer and Reproductive Harm from exposure to lead — www.P65Warnings.ca.gov P65Warnings.ca.gov

Inspected and graded before it's listed · 30-day returns

Make sure this fits your car

Fits E46 316i, 316ti, 318i, 318ti 2001–03 — N40, N42 engines

Select your vehicle to check fitment
See all 35 fitting cars
Cap – BMW diagram

Callout 03 on BMW’s drawing “Alternator single parts, 90/110A Bosch”. Open the drawing →

Also shown on Alternator single parts, 120/140A Bosch.

This is a genuine BMW cap, part number 12 31 7 505 923. You will find it under Electrical (Alternator with motor and mounting).

Fits E46 316i, 316ti, 318i and 318ti (2001–2003) with the N40 or N42 engines.

BMW draws it on 2 drawings, among them Alternator single parts, 90/110A Bosch and Alternator single parts, 120/140A Bosch. It weighs about 80 g (0.2 lb).

Out of stock. Request it and we will notify you when it is in stock.

Details

EnginesN40, N42
Weight0.08 kg

Used parts are inspected and graded: Good (minimal wear), Fair (normal wear) or Acceptable (visible wear). All fully working. Returns: 30 days if a part arrives damaged or not as described.

The other parts on BMW’s drawing “Alternator single parts, 90/110A Bosch”. Open the drawing →

#PartIn stockAction
--Compact alternator2 numbers at this calloutOut of stockRequest
01Pulley alternatorOut of stockRequest
02Voltage regulatorOut of stockRequest
03Cap · this partOut of stock
04Hex Bolt with washerOut of stockRequest
05Cap nutOut of stockRequest

Reviews

No reviews yet.

InElectricalAlternator with motor and mounting