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BMW Electrical Sensors, Switches, & Relays

Electrical gremlins can be very frustrating. Luckily your BMW's electrical system is better than most, even if it's 25 years old. Here you will find electrical relays, sensors, switches, and modules for the engine, camshaft, and crankshaft. Our parts are OEM, Genuine BMW, or approved aftermarket brands that we have an excellent track record with. There is no middle ground with electrical parts - it either works perfectly or not. And there's nothing more frustrating than a new part that fails right out of the box. So it's important to choose quality replacement parts over a cheap but faulty piece.

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Bosch Starter Motor With Hardware

10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:56110332

Part#: SR0492NKT4

In Stock

$ 273.99

This product was last offered at the strikethrough price on
08-14-2026

$ 261.99 USD

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$ 261.99 USD

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At the core is a brand-new Bosch Starter Motor, engineered to withstand extreme operating conditions while delivering immediate cranking speed. This kit includes also the required Genuine BMW Aluminum Mounting Screw Set.

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Knock Sensor

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T#:54388475

Part#: 13627636937

In Stock

$ 29.99

This product was last offered at the strikethrough price on
10-18-2026

$ 24.99 USD

Limited Qty Sale

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$ 29.99

This product was last offered at the strikethrough price on
10-18-2026

$ 24.99 USD

Limited Qty Sale

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Keep your ignition timing razor-sharp and your engine safe from destructive detonation. This replacement Knock Sensor acts as your engine's first line of defense, constantly listening for pre-ignition "pinging" or knocking.

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MINI Alternator - SEG Automotive 0125.711.078

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T#:54851993

Part#: 12317613445

In Stock

$ 564.99

This product was last offered at the strikethrough price on
07-16-2026

$ 563.99 USD

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$ 563.99 USD

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SEG Automotive Alternator - SEG Automotive 0121.715.118 - 12317560985...

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T#:54851991

Part#: 12317560985

Ships in 2 Business Days

$ 1,049.99

This product was last offered at the strikethrough price on
07-16-2026

$ 961.99 USD

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$ 961.99 USD

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Battery Cable - With Pole

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T#:54388517

Part#: 61129259425

Ships in 2 Business Days

$ 126.99 USD

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$ 126.99 USD

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On the track or on the street, your BMW’s electrical architecture demands absolute consistency. A degraded positive battery cable introduces unwanted resistance, leading to weak starts, alternator strain, and erratic module behavior. When it’s time to replace a compromised factory cable, you don’t need over-hyped marketing—you need a part that fits precisely and restores factory grid integrity.

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MINI Alternator - SEG Automotive 0124.325.157

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T#:54851988

Part#: 12317550319

Ships in 2 Business Days

$ 473.99

This product was last offered at the strikethrough price on
07-16-2026

$ 436.99 USD

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$ 436.99 USD

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SEG Automotive Starter - SEG Automotive 0001.108.460 - 12417610344 - ...

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T#:55857741

Part#: 12417610344

Ships in 2 Business Days

$ 368.99

This product was last offered at the strikethrough price on
07-16-2026

$ 340.99 USD

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$ 340.99 USD

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MINI Starter - SEG Automotive 0001.106.026

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T#:54851997

Part#: 12411489995

Ships in 2 Business Days

$ 432.99

This product was last offered at the strikethrough price on
07-16-2026

$ 406.99 USD

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$ 406.99 USD

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SEG Automotive Alternator - SEG Automotive 0124.525.588 - 12317541694...

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T#:54851984

Part#: 12317541694

Ships in 2 Business Days

$ 521.99

This product was last offered at the strikethrough price on
07-16-2026

$ 474.99 USD

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$ 474.99 USD

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SEG Automotive Alternator - SEG Automotive 0124.515.223 - 12317519618...

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T#:54851980

Part#: 12317519618

Ships in 2 Business Days

$ 503.99

This product was last offered at the strikethrough price on
07-16-2026

$ 462.99 USD

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$ 462.99 USD

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SEG Automotive New 150A Alternator - 0124.525.561 - E21, E30, E36, E4...

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T#:58965212

Part#: 0124.525.561

Ships on Nov 18, 2026

$ 487.99 USD

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$ 487.99 USD

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SEG Automotive, the company behind Bosch's starter motor and generator business, builds this brand-new 150-amp alternator with a freewheel pulley that smooths out belt loads for a quieter, longer-lasting accessory drive.

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SEG Automotive New 120A Alternator - 0124.515.052 - E46, E39 525i 530...

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T#:58965210

Part#: 0124.515.052

Ships on Nov 18, 2026

$ 485.99 USD

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$ 485.99 USD

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A strong charging system keeps everything from your ignition to your stereo working at its best, and a failing alternator can undermine all of it.

Starter Motor

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T#:59001784

Part#: 12417616698

Ships on Nov 18, 2026

$ 275.99 USD

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$ 275.99 USD

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On a MINI built for quick, spirited driving, there is no reason to put up with slow or hesitant cranking.

SEG Automotive N47 N57 Starter Motor - 0001.148.508 - F3x, F10 5 Seri...

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T#:58965209

Part#: 0001.148.508

Ships on Nov 18, 2026

$ 274.99 USD

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$ 274.99 USD

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A healthy starter is what gets your BMW from parked to pulling away without a second thought.

Starter Motor

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T#:59001789

Part#: 12417570487

Ships on Nov 18, 2026

$ 325.99 USD

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$ 325.99 USD

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This SEG Automotive unit is built as a direct replacement for the factory 0.9 kW starter on the R50 Hatch and R52 Convertible.

SEG Automotive New Alternator - 0124.525.523 - E46 325i 325Ci 330Ci, ...

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T#:58965213

Part#: 0124.525.523

Ships on Nov 18, 2026

$ 495.99 USD

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$ 495.99 USD

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Your BMW's charging system powers everything from ignition to infotainment, so a weak alternator affects the whole car.

SEG Automotive B46 B48 New Starter Motor - 0001.170.202 - F3x 330i 43...

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T#:58965208

Part#: 0001.170.202

Ships on Nov 18, 2026

$ 216.99 USD

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$ 216.99 USD

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The smart choice for F-chassis owners who want their car starting on the first try, every time.

SEG Automotive Starter - 12418589891 - G30 540d xDrive

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T#:59001787

Part#: 12418589891

Ships on Nov 18, 2026

$ 276.99 USD

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$ 276.99 USD

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Modern G-chassis BMWs deliver serious performance, and none of it matters if the engine won't start.

Bosch Starter Solenoid - 12411427080 - E36, E46, E34, E39, E60, E83 ...

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T#:57231530

Part#: 12411427080

Special Order: No Guaranteed ETA

$ 78.99 USD

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$ 78.99 USD

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When you are at the track or gearing up for a weekend backroad drive, the last thing you need is a sluggish starter holding your BMW back.

Starter - Remanufactured

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T#:57267807

Part#: 12418621839

Special Order: No Guaranteed ETA

$ 342.99 USD

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$ 342.99 USD

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Bosch Starter - 12418625995 - F3x, F22, F23, G30 5 Series, G01, G02 ...

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T#:57267806

Part#: 12418625995

Special Order: No Guaranteed ETA

$ 463.99 USD

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$ 463.99 USD

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Bosch starter units deliver the high-torque cranking performance required to reliably start modern high-compression BMW engines under all thermal conditions.

Bosch Starter - SR3295N - F07, F10 5 Series, F12 F13 6 Series, F01 F0...

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T#:57304035

Part#: SR3295N

Special Order: No Guaranteed ETA

$ 441.99 USD

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$ 441.99 USD

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This new starter delivers crisp power and rapid engine speed recovery, avoiding the typical voltage drop issues associated with worn original units.

Remanufactured Alternator - 12V - 170A

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T#:57267766

Part#: 12317605478

Special Order: No Guaranteed ETA

$ 499.99 USD

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$ 499.99 USD

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Maintain peak battery performance and protect your vehicle's complex electrical architecture with a motorsport-tested, factory-grade charging replacement.

Remanufactured Alternator

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T#:57267768

Part#: 12317616126

Special Order: No Guaranteed ETA

$ 571.99 USD

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$ 571.99 USD

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Keep your BMW's vital electronics powered and your engine running at peak efficiency with a premium remanufactured alternator from Bosch.

Starter - Remanufactured

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T#:57304037

Part#: 12417843530

Special Order: No Guaranteed ETA

$ 412.99 USD

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$ 412.99 USD

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Ensure your high-performance engine cranks reliably every time with an OE-quality starter motor from Bosch.

AL41X Remanufactured Alternator

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T#:57231540

Part#: 12311466084

Special Order: No Guaranteed ETA

$ 286.99 USD

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$ 286.99 USD

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Ensure your BMW or European vehicle maintains uninterrupted power under demanding driving conditions with this premium remanufactured alternator by Bosch.

Remanufactured Alternator - 12V - 150 A

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T#:57267763

Part#: AL0757X

Special Order: No Guaranteed ETA

$ 430.99 USD

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$ 430.99 USD

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This high-output Bosch remanufactured alternator ensures your ignition system and performance electronics receive clean, steady amperage under high-demand driving conditions.

Remanufactured Alternator

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T#:57267767

Part#: 12317561004

Special Order: No Guaranteed ETA

$ 695.99 USD

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$ 695.99 USD

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This Bosch remanufactured alternator delivers the rock-solid current required to keep your ignition, fuel management, and chassis electronics operating at peak efficiency under demanding conditions.

Remanufactured Starter

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T#:57376671

Part#: SR71XKT

Back Ordered

$ 342.99

This product was last offered at the strikethrough price on
08-23-2026

$ 212.99 USD

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$ 212.99 USD

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The Bosch SR71X Remanufactured Starter delivers the precise, high torque cranking performance needed to keep your vehicle starting cleanly on the street or at the track

BMW Alternator 150 Amp - Bosch AL0839X

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T#:57376634

Part#: AL0839XKT

Back Ordered

$ 476.86

This product was last offered at the strikethrough price on
08-23-2026

$ 422.86 USD

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$ 422.86 USD

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Protect your BMW's electrical performance on the road and track with the Bosch AL0839X remanufactured alternator. Designed to handle high demand electrical loads under spirited driving conditions

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