BMW Electrical Sensors, Switches, & Relays for BMW E21 320i M10 1.8L

Genuine BMW 5 Prong Salmon Relay - Multiple BMWs

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T#:5390

Part#: 12631742690

In Stock

7% off MSRP $ 24.65

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$ 22.99 USD

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7% off MSRP

$ 24.65

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$ 22.99 USD

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This relay is used for the SMG system on the E46 M3 and various applications including secondary air systems on other BMW's. If you find that your SMG-equipped E46 M3 is not starting, this is one of the first places to check as it controls power to the hydraulic unit (the car will not start without hydraulics). Buy one to fix the issue and buy a second so you're not stranded in the future!

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Genuine BMW Oil Pressure Switch

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T#:141613

Part#: 61311243414

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$ 27.99 USD

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$ 27.99 USD

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Genuine BMW Oil Pressure Switch - M12X1,5

OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...

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T#:19326

Part#: 12311726022

In Stock at Vendor

$ 71.99

This product was last offered at the strikethrough price on
01-28-2026

$ 63.99 USD

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This is the voltage regulator found on the back of the alternator. It's a normal wear item and the contacts are the first thing to check if you believe the alternator is not charging the battery (lights flickering or dim, battery light on in the dash, the engine quits without warning, or other electrical failures). The voltage regulator manages the voltage flowing through the car, especially to and from the battery. There are two carbon contacts on the regulator that control the magnetic field when the alternator is spinning and these contacts wear over time. A new set of contacts will be about 13mm in length. Anything less than 5mm and the voltage regulator should be replaced, regardless if that is the cause of your electrical problems or not. Most older mechanics will tell you to keep a spare regulator in your toolbox.

The carbon contacts can be replaced on their own but requires desoldering the old ones from the base and then soldering the new ones on. It may be easier to just replace the unit as a whole.

This is the OEM voltage regulator, made by Bosch or Hella. It's the one with the white base and fits most Bosch alternators from 1977-1995 (Valeo and other alternators look very different and have a black cover and base). This part number replaces the previous BMW part numbers - 12311271664, 12321279548, 12311722755, 12321711399 and Bosch part numbers 1197311021 and 1197311028.

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Genuine BMW Alternator Bushing (20 mm Length) - E10 E12 E21 E23 E24 E...

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T#:22410

Part#: 12311268447

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4% off MSRP $ 45.99

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$ 43.99 USD

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4% off MSRP

$ 45.99

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$ 43.99 USD

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Genuine BMW Bush - 90 Shore Lang

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

Genuine BMW Socket repair kit

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T#:207094

Part#: 61132359996

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$ 29.99 USD

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Genuine BMW Rep. Kit For Socket Housing - 4 Pol.
This item fits the following BMW Chassis:
E46 M3,E46,E85 Z4,E90,F30,F31,F32,F33,F34,F36,F80 M3,F82 M4,F83

Hella Hella Horn - Low Tone

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T#:590880

Part#: 2768082

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$ 36.99 USD

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Disc Type Low-Tone, 12 V, 335 Hz with Bracket

Hella Hella Horn - High Tone

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T#:592707

Part#: 2768551

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$ 30.99 USD

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$ 30.99 USD

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Disc Type High-Tone, 12 V, 400 Hz with Bracket

Genuine BMW Positive Battery Cable - E21 320i

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T#:39337

Part#: 12421732447

In Stock

4% off MSRP $ 71.99

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$ 68.99 USD

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4% off MSRP

$ 71.99

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$ 68.99 USD

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Genuine BMW BATTERY CABLE (PLUS POLE)

OEM Schaeffler Alternator Bearing - BMW E21 E30 E36 E12 E28 E34 E23 E...

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T#:41965072

Part#: 6201-Z

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$ 30.99 USD

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Offered by OEM Schaeffler, this bearing replaces BMW part number 12311739203, which is found in numerous BMW alternators manufactured prior to 1996. This bearing helps to stabilize the shaft of the alternator, allowing it to spin freely. If you are experiencing a loud squeaking or grinding noise from your alternator, there is a good chance one of the internal bearings has failed and needs to be replaced.

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Hella Air Horn Kit

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T#:592708

Part#: 3001651

In Stock at Vendor

$ 143.99

This product was last offered at the strikethrough price on
05-07-2026

$ 139.99 USD

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Get noticed with this air horn kit from Hella!

Genuine BMW Alternator Brush Set

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T#:7133

Part#: 12311727756

Ships in 1-2 days

4% off MSRP $ 25.99

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$ 24.99 USD

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$ 25.99

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$ 24.99 USD

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Genuine BMW Carbon Brush Set

This item fits the following BMW Chassis:
E30 M3,E34 M5,E30,E34,E36

Fits BMW Engines including:
M10,M20,M30,M42,M50,M70,S14,S38,S70

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Genuine BMW Temperature Sensor

For vehicles with a production date from 09/1979

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T#:200307

Part#: 13621362599

Ships in 4 Business Days

8% off MSRP $ 255.99

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$ 234.99 USD

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$ 255.99

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$ 234.99 USD

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Genuine BMW Temperature-Time Switch

Genuine BMW Alternator Bushing (Red) (8 mm Length) - E10 E12 E21 E23 ...

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T#:22411

Part#: 12311268449

Ships in 4 Business Days

5% off MSRP $ 40.99

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$ 38.99 USD

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$ 40.99

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$ 38.99 USD

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Genuine BMW Bush - 90 Shore Kurz

Fits BMW Engines including:
M10,M20,M30

Fan Wheel - E10, E12, E21, E23, E24, E28, E3, E9

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T#:38759

Part#: 12311350199

Ships in 7 Business Days

6% off MSRP $ 53.99

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$ 50.99 USD

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$ 53.99

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$ 50.99 USD

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Genuine BMW FAN WHEEL

Fits BMW Engines including:
M10,M20,M30

Supporting Bracket - E10, E21

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T#:39076

Part#: 12318602032

Ships in 7 Business Days

6% off MSRP $ 82.99

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$ 77.99 USD

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$ 82.99

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$ 77.99 USD

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Genuine BMW SUPPORTING BRACKET

Fits BMW Engines including:
M10

Woodruff Key

4X5

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T#:28561

Part#: 07119951453

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$ 3.99 USD

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$ 3.99 USD

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Genuine BMW Woodruff Key
This item fits the following BMW Chassis:
E30 M3,E70 X5M,E71 X6M,E53 48IS,E30,E34,E36,E53 X5 X5,E63,E65,E70 X5,E71 X6,F01,F02,F06,F10,F12,F13,F15,F16

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Electrical Connector - Priced Each

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T#:367145

Part#: 61132359999

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$ 18.99 USD

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$ 18.99 USD

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2 pin used in many locations on late model BMWs

Cloth Webbed Adhesive Tape - 7.5 Meters

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T#:42873702

Part#: 61135B70D27

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$ 11.99 USD

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$ 11.99 USD

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Alternator / PS / AC Idler Nut

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T#:7139

Part#: 12317677914

In Stock

$ 15.24

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$ 15.23 USD

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$ 15.23 USD

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GENUINE BMW ENGINE ELECTRICAL IDLER 12317677914

Repair Kit For Socket

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T#:528834

Part#: 61132359992

In Stock

7% off MSRP $ 14.99

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$ 13.99 USD

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$ 14.99

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$ 13.99 USD

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Genuine BMW Terminal Socket - Mcon 2.8 - Multiple BMWs

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T#:40627

Part#: 12527567482

In Stock

Sale - Save 50% $ 1.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 0.99 USD

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Sale - Save 50%

$ 1.99

This product was last offered at the strikethrough price on
05-02-2026

$ 0.99 USD

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Used in a wide variety of BMW connectors, these terminal sockets can come in handy when working on your wiring components.

Genuine BMW Electrical Connector Repair Kit - Multiple BMWs ...

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T#:206288

Part#: 61132359999

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$ 19.99 USD

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$ 19.99 USD

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This is a Genuine BMW 2 pin connector that is used in many places by BMW.

Hella Horn - Low-Tone

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T#:28869559

Part#: 7424001

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$ 17.99 USD

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$ 17.99 USD

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Universal fit. Not direct fit.

Hella Relay

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T#:592718

Part#: 965400001

In Stock

$ 14.99 USD

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$ 14.99 USD

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12V 30A SPST relay with bracket

Febi Alternator Mount Bushing - E12, E21, E23, E24, E28, E30 ...

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T#:381815

Part#: 12311268433

In Stock

$ 3.99

This product was last offered at the strikethrough price on
12-18-2025

$ 2.99 USD

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$ 2.99 USD

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Reduces alternator vibration.

Liqui-Moly Battery Clamp Grease - 50 grams

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T#:1195997

Part#: 20244

In Stock

$ 7.79

This product was last offered at the strikethrough price on
02-24-2026

$ 6.69 USD

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$ 6.69 USD

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Excellent corrosion protection for your battery and other connections

15A Fuse - Priced Each

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T#:375327

Part#: 61131372626

In Stock at Vendor

$ 2.03 USD

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$ 2.03 USD

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OEM Bosch Starter Relay - E21 320i

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T#:583822

Part#: 61311243207

In Stock at Vendor

$ 4.99 USD

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$ 4.99 USD

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This is a brand new starter relay from OEM supplier Bosch. If you have replaced your starter and have ruled out every other issue, this relay could restore your starters operation and get your car back up and running.

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Hella 5-Prong Fuel Injection Relay - E21, E23, E24, E28, E30, E34 ...

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T#:7175

Part#: 12631708646

In Stock at Vendor

$ 22.99

This product was last offered at the strikethrough price on
01-05-2026

$ 20.99 USD

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$ 20.99 USD

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This part has been superseded to BMW Part 12631708647

Temperature Sensor

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T#:29898445

Part#: 13621362599

In Stock at Vendor

$ 283.99

This product was last offered at the strikethrough price on
04-10-2026

$ 262.99 USD

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$ 262.99 USD

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Genuine BMW Temperature-Time Switch

Washer - E12, E21, E23, E24, E28, E30

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T#:38719

Part#: 12311268420

Ships in 1-2 days

$ 10.99 USD

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$ 10.99 USD

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Genuine BMW Washer

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

Genuine BMW Universal Socket Housing

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T#:21280

Part#: 61138352304

Ships in 1-2 days

7% off MSRP $ 28.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 26.99 USD

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7% off MSRP

$ 28.99

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$ 26.99 USD

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Genuine BMW Universal Socket Housing, Uncoded - 3 Pol.
This item fits the following BMW Chassis:
E36 M3,E34 M5,E39 M5,E60 M5,E46 M3,E70 X5M,E71 X6M,E82 1M Coupe,E53 48IS,E34,E36,E38,E39,E46,E53 X5,E65,E70 X5,E71 X6,E82,E83 X3,E89 Z4,E90,F01,F02,F06,F10,F12,F13

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Washer

10X5,3X1-200 Hv

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T#:215808

Part#: 07119904206

Ships in 1-2 days

$ 1.99 USD

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$ 1.99 USD

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Genuine BMW Washer - 07119904206

Genuine BMW 10 Pole Socket Housing - Multiple BMWs

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T#:540927

Part#: 61139277742

Ships in 1-2 days

$ 4.99 USD

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$ 4.99 USD

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Fixing a faulty connection in your BMWs electrical system? This 10 pole socket housing is a Genuine BMW replacement.

Genuine BMW Voice Recognition SES Adapter Plug - Multiple BMWs ...

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T#:11467

Part#: 84110018038

Ships in 4 Business Days

$ 6.99 USD

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$ 6.99 USD

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Adjusting Bar - E21

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T#:7140

Part#: 12318602037

Ships in 7 Business Days

3% off MSRP $ 35.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 34.99 USD

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3% off MSRP

$ 35.99

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$ 34.99 USD

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Genuine BMW ENGINE ELECTRICAL ADJUSTING BAR 12318602037.--

This item fits the following BMWs:
BMW 1600, 2002, 2002tii
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

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Genuine BMW Engine Electrical Adjusting Bar 12311273638

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T#:7122

Part#: 12311273638

Special Order: No Guaranteed ETA

4% off MSRP $ 48.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 46.99 USD

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4% off MSRP

$ 48.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 46.99 USD

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Genuine BMW ENGINE ELECTRICAL ADJUSTING BAR 12311273638.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

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FAE Oil Pressure Switch - E10, E12, E21, E23, E24, E28, E30

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T#:16202

Part#: 61311354274

Ships on Jun 26, 2026

$ 7.13 USD

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$ 7.13 USD

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OIL PRESSURE SWITCH

Hella Horn - High-Tone

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T#:592716

Part#: 7424011

In Stock

$ 17.99 USD

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$ 17.99 USD

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Upgrade the sound of your BMW or MINI with the Hella Horn - High-Tone. This high-quality horn delivers a powerful and attention-grabbing sound, enhancing safety on the road. Designed for easy installation, it provides a quick and effective way to improve the audible presence of your vehicle.