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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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Hitachi Voltage Regulator - BMW E31 E32 E34 E36

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T#:48850064

Part#: 12311747920

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$ 37.99 USD

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$ 37.99 USD

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This voltage regulator is a crucial component that controls the alternator's output, preventing overcharging by adjusting the current to maintain a safe range of vehicle voltage, thereby protecting the battery and electrical system. Symptoms of failure include dim lights, battery warnings, or a dead battery, often requiring replacement, which can be internal or external to the alternator.

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BMW Alternator - SEG Automotive 0121.715.118

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T#:54851991

Part#: 12317560985

In Stock at Vendor

$ 1,049.99 USD

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$ 1,049.99 USD

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MINI Alternator - SEG Automotive 0125.711.078

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T#:54851993

Part#: 12317613445

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$ 563.99 USD

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$ 563.99 USD

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Hitachi Camshaft Position Sensor - BMW E9X F3X F8X N20 N52 N55 S55 ...

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T#:48815454

Part#: 13627525014

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$ 40.00 USD

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$ 40.00 USD

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The camshaft position sensor communicates the position of the camshaft to the computer. This helps the computer to calculate proper spark and fuel control. If you're struggling with CELs, hard starts or no starts, stalling, and/or a rough idle, you may need to replace the cam position sensor.

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Hitachi Engine Camshaft Position Sensor - BMW S63M N63B/N63M/N63R S68...

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T#:48850059

Part#: 13628697982

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$ 48.99 USD

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$ 48.99 USD

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The camshaft position sensor communicates the position of the camshaft to the computer. This helps the computer to calculate proper spark and fuel control. If you're struggling with CELs, hard starts or no starts, stalling, and/or a rough idle, you may need to replace the cam position sensor.

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Hitachi Engine Crankshaft Position Sensor - BMW N52 N54 S85 S65 S63 ...

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T#:48815471

Part#: 13627525015

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$ 66.99 USD

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$ 66.99 USD

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The crankshaft position sensor transmits the crankshaft's position to the computer. This helps the computer to calculate proper spark and fuel control. If you're struggling with CELs, hard starts or no starts, stalling, and/or a rough idle, you may need to replace the crank position sensor.

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Hitachi Engine Crankshaft Position Sensor - BMW F2X F3X

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T#:48850074

Part#: 13627582842

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$ 184.99 USD

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$ 184.99 USD

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Engine cranks but doesn't start? This sensor is often the issue.

Hitachi Camshaft Position Sensor - E39, E46, E53, E60, E63, E64, E65,...

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T#:48850055

Part#: 12147518628

Ships in 2 Business Days

$ 71.99 USD

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The camshaft position sensor is essential for assisting the engine DME by monitoring the camshaft's position. The data from this sensor is key to optimizing ignition timing and ensuring smooth engine performance. Often referred to as the CMP sensor, this component is crucial for the overall functionality of the powertrain. A failing camshaft position sensor can cause a range of issues, including engine stumbling, hesitation during acceleration, power loss, and even starting difficulties or complete failure to start.

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Hitachi Camshaft Position Sensor - Intake - BMW M52TU M54

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T#:48850072

Part#: 12147539165

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$ 41.99 USD

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$ 41.99 USD

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A bad cam sensor can cause a variety of problems from hard starting to stalling at low speeds. Cam sensor replacement has been known to cure many drivabilty issues. Uses O-ring # 12 141 748 398 (not included)

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BMW Alternator - SEG Automotive 0124.525.588

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T#:54851984

Part#: 12317541694

In Stock at Vendor

$ 521.99 USD

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$ 521.99 USD

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BMW Starter - SEG Automotive 0001.108.460

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T#:55857741

Part#: 12417610344

In Stock at Vendor

$ 367.99

This product was last offered at the strikethrough price on
07-10-2026

$ 281.99 USD

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$ 281.99 USD

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MINI Alternator - SEG Automotive 0124.325.157

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T#:54851988

Part#: 12317550319

In Stock at Vendor

$ 473.99 USD

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$ 473.99 USD

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Hitachi Crankshaft Sensor - BMW B46 B48 B58

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T#:48850081

Part#: 13627806782

Ships in 6 Business Days

$ 81.99 USD

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$ 81.99 USD

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Tells the computer whether the timing is correct in the engine.

BMW Alternator - SEG Automotive 0124.515.223

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T#:54851980

Part#: 12317519618

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$ 502.99 USD

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$ 502.99 USD

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Hitachi Voltage Regulator - BMW E88 N52

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T#:48815477

Part#: 12317550469

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$ 79.99 USD

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$ 79.99 USD

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Supplies power to your car's electronics and recharges the battery.

Hitachi Crankshaft Position Sensor - BMW M52 S52 M54

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T#:48815470

Part#: 12141709616

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$ 32.99 USD

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$ 32.99 USD

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NOTE: Does not include o-ring seal - see BMW # 12141748398 This is the crankshaft position sensor. It provides information for the ECU. A faulty sensor can cause issues with timing adjustment and limit performance and vehicle operation. Replace your sensor with a high-quality Hitachi sensor to restore peak performance.

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Hitachi Crankshaft Position Sensor - BMW N20 N26 2.0L

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T#:48815475

Part#: 13627595860

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$ 68.99 USD

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$ 68.99 USD

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This is the crankshaft position sensor. It provides information for the ECU. A faulty sensor can cause issues with timing adjustment and limit performance and vehicle operation. Replace your sensor with a high-quality Hitachi sensor to restore peak performance.

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Hitachi Voltage Regulator - BMW E36 Z3 E34

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T#:48850070

Part#: 12321739435

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$ 60.99 USD

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$ 60.99 USD

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Alternator voltage regulators are a crucial component that controls the alternator's output, preventing overcharging by adjusting the current to keep vehicle voltage within a safe range, protecting the battery and electrical system. Symptoms of failure include dim lights, battery warnings, or a dead battery, often requiring replacement, which can be internal or external to the alternator

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