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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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Knock Sensor
Knock Sensor
Bosch - Corporate Logo
T#:54388475
Part#: 13627636937
In Stock
New Item
$ 29.99 USD
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$ 29.99 USD
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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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Intensity Lithium-ION Battery - i34RX - 11.5lbs
Intensity Lithium-ION Battery - i34RX - 11.5lbs
Braille - Corporate Logo
T#:54388454
Part#: I34RX
Ships on Oct 27, 2026
New Item
$ 949.99 USD
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$ 949.99 USD
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Whether you're building a dedicated track weapon or upgrading your street machine for ultimate reliability, unsprung and upper-chassis weight is the enemy of performance. Positioned high up in the engine bay or rear corners, a heavy factory battery negatively impacts your car's center of gravity.
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BMW Alternator - SEG Automotive 0121.715.118
BMW Alternator - SEG Automotive 0121.715.118
SEG Automotive - Corporate Logo
T#:54851991
Part#: 12317560985
Ships in 1 Business Day
New Item
$ 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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MINI Alternator - SEG Automotive 0125.711.078
MINI Alternator - SEG Automotive 0125.711.078
SEG Automotive - Corporate Logo
T#:54851993
Part#: 12317613445
Ships in 1 Business Day
New Item
$ 564.99

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

$ 521.99 USD
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$ 521.99 USD
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BMW Starter - SEG Automotive 0001.108.460
BMW Starter - SEG Automotive 0001.108.460
SEG Automotive - Corporate Logo
T#:55857741
Part#: 12417610344
Ships in 1 Business Day
New Item
$ 368.99

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

$ 337.99 USD
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$ 337.99 USD
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BMW Alternator - SEG Automotive 0124.515.223
BMW Alternator - SEG Automotive 0124.515.223
SEG Automotive - Corporate Logo
T#:54851980
Part#: 12317519618
Ships in 1 Business Day
New Item
$ 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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MINI Starter - SEG Automotive 0001.106.026
MINI Starter - SEG Automotive 0001.106.026
SEG Automotive - Corporate Logo
T#:54851997
Part#: 12411489995
Ships in 1 Business Day
New Item
$ 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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Vargas Plug & Play Pre And Post Throttle MAP Sensor Kit - 6B 4W - BMW B58/S55/S58
Vargas Plug & Play Pre And Post Throttle MAP Sensor Kit - 6B 4W - BMW...
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
T#:52129729
Part#: VTT56BSENSKIT64
Ships in 10 Business Days
New Item
$ 209.99 USD
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$ 209.99 USD
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The VTT 6-Bar MAP sensor kit provides the necessary overhead to monitor boost levels with a linear voltage scale that makes software calibration straightforward.
Vargas MAP Sensor Extension Harness - BMW B58, N54, N55, S55, S58, S63
Vargas MAP Sensor Extension Harness - BMW B58, N54, N55, S55, S58, S6...
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
T#:51672717
Part#: VTT-MAP-HARNESS
Ships in 10 Business Days
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$ 59.99 USD
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$ 59.99 USD
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As part of the VTT-FAB fabrication line, this extension harness is designed for builders and tuners who need flexibility.
Vargas Coolant Level Extension Harness - BMW B48/B58/S58
Vargas Coolant Level Extension Harness - BMW B48/B58/S58
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
T#:51813310
Part#: VTT-FAB-HC
Ships in 10 Business Days
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$ 49.99 USD
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$ 49.99 USD
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Simplify your next fabrication project with the VTT-FAB series Coolant Extension Harness.
MINI Alternator - SEG Automotive 0124.325.157
MINI Alternator - SEG Automotive 0124.325.157
SEG Automotive - Corporate Logo
T#:54851988
Part#: 12317550319
Ships in 1 Business Day
New Item
$ 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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BMW Alternator - SEG Automotive 0124.525.588
BMW Alternator - SEG Automotive 0124.525.588
SEG Automotive - Corporate Logo
T#:54851984
Part#: 12317541694
Ships in 1 Business Day
New Item
$ 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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Vargas USB To Serial For HPFP Controller - BMW N54
Vargas USB To Serial For HPFP Controller - BMW N54
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
T#:51778112
Part#: N54-USB-SERIAL-H
Ships in 10 Business Days
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$ 37.99 USD
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$ 37.99 USD
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Take full control of your N54’s fueling system with the Vargas Turbo Technologies USB to Serial adapter.
New 120A Alternator
New 120A Alternator
SEG Automotive - Corporate Logo
T#:58965210
Part#: 0124.515.052
Ships on Nov 3, 2026
New Item
$ 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.
New Alternator
New Alternator
SEG Automotive - Corporate Logo
T#:58965213
Part#: 0124.525.523
Ships on Nov 3, 2026
New Item
$ 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.
Starter Motor
Starter Motor
SEG Automotive - Corporate Logo
T#:59001789
Part#: 12417570487
Ships on Nov 3, 2026
New Item
$ 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.
New 150A Alternator
New 150A Alternator
SEG Automotive - Corporate Logo
T#:58965212
Part#: 0124.525.561
Ships on Nov 3, 2026
New Item
$ 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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Starter Motor
Starter Motor
SEG Automotive - Corporate Logo
T#:58965209
Part#: 0001.148.508
Ships on Nov 3, 2026
New Item
$ 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.
Alternator
Alternator
SEG Automotive - Corporate Logo
T#:59001785
Part#: 12311711204
Ships on Nov 3, 2026
New Item
$ 726.99 USD
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$ 726.99 USD
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The E24 M635CSi is one of BMW's great grand tourers, and keeping one healthy means a charging system you can count on.
New Starter Motor
New Starter Motor
SEG Automotive - Corporate Logo
T#:58965208
Part#: 0001.170.202
Ships on Nov 3, 2026
New Item
$ 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.
Starter Motor
Starter Motor
SEG Automotive - Corporate Logo
T#:59001784
Part#: 12417616698
Ships on Nov 3, 2026
New Item
$ 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.
Starter
Starter
SEG Automotive - Corporate Logo
T#:59001787
Part#: 12418589891
Ships on Nov 3, 2026
New Item
$ 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.
Remanufactured Alternator - 12V - 170A
Remanufactured Alternator - 12V - 170A
Bosch - Corporate Logo
T#:57267766
Part#: 12317605478
Special Order: No Guaranteed ETA
New Item
$ 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
Remanufactured Alternator
Bosch - Corporate Logo
T#:57267768
Part#: 12317616126
Special Order: No Guaranteed ETA
New Item
$ 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
Starter
Bosch - Corporate Logo
T#:57304035
Part#: SR3295N
Special Order: No Guaranteed ETA
New Item
$ 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.
Starter Solenoid
Starter Solenoid
Bosch - Corporate Logo
T#:57231530
Part#: 12411427080
Special Order: No Guaranteed ETA
New Item
$ 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
Starter
Bosch - Corporate Logo
T#:57267806
Part#: 12418625995
Special Order: No Guaranteed ETA
New Item
$ 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.
Starter - Remanufactured
Starter - Remanufactured
Bosch - Corporate Logo
T#:57267807
Part#: 12418621839
Special Order: No Guaranteed ETA
New Item
$ 342.99 USD
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$ 342.99 USD
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Starter - Remanufactured
Starter - Remanufactured
Bosch - Corporate Logo
T#:57304037
Part#: 12417843530
Special Order: No Guaranteed ETA
New Item
$ 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
AL41X Remanufactured Alternator
Bosch - Corporate Logo
T#:57231540
Part#: 12311466084
Special Order: No Guaranteed ETA
New Item
$ 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
Remanufactured Alternator
Bosch - Corporate Logo
T#:57267767
Part#: 12317561004
Special Order: No Guaranteed ETA
New Item
$ 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 Alternator - 12V - 150 A
Remanufactured Alternator - 12V - 150 A
Bosch - Corporate Logo
T#:57267763
Part#: AL0757X
Special Order: No Guaranteed ETA
New Item
$ 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 Starter
Remanufactured Starter
Bosch - Corporate Logo
T#:57376671
Part#: SR71XKT
Back Ordered
New Item
$ 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
BMW Alternator 150 Amp - Bosch AL0839X
Bosch - Corporate Logo
T#:57376634
Part#: AL0839XKT
Back Ordered
New Item
$ 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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