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BMW Electrical Sensors, Switches, & Relays for BMW 5 Series E39 (1996-2003)

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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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Mass Air Flow Sensor (MAF)

T#:367846

Part#: 13621702078

Ships in 1-2 days

4% off MSRP $ 767.99

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

$ 733.99 USD

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4% off MSRP

$ 767.99

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

$ 733.99 USD

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The MAF (Mass Air Flow) sensor regulates the fuel flow through the injectors based on the intake air volume. If your vehicle displays a MAF code, it's crucial to replace it promptly to optimize gas mileage and performance. MAF failure often occurs gradually, leading to decreased fuel efficiency and compromised performance. When it fails completely, the vehicle may stutter and stall, entering a limp mode. A simple test involves unplugging the connector before starting the car. If the idle improves compared to previous poor idling, it's a sign that the MAF needs replacement. Neglecting this maintenance can lead to decreased fuel economy, as excessive fuel is injected into the engine without being efficiently burned. Opting for a genuine BMW replacement ensures stock-quality performance, offering your vehicle an efficiency boost.

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Vehicle Alarm System Control Unit - E39, E46

T#:154859

Part#: 65756938049

Ships in 8 Business Days

2% off MSRP $ 223.99

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

$ 219.99 USD

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2% off MSRP

$ 223.99

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

$ 219.99 USD

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Genuine BMW Ultra Sonic-Module -
This item fits the following BMW Chassis:
E39,E46

Bosch Alternator - 120 Amp - E46, E39, Z3 2001-2005 (with factory Val...

T#:386207

Part#: AL0703X

Ships on Oct 22, 2026

$ 844.99 USD

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$ 844.99 USD

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120 amp Bosch alternator for many BMW 6 cylinders (see list below). Replaces stock Valeo alternator with rectangular plug on the back. Bosch is an original equipment supplier to BMW, and is the finest and most recognized German brand of alternator available. Buy only the best alternator for your BMW -- buy a Bosch alternator. Same as BMW part#1231751599.

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their exacting assembly process and high level of durability you can expect a long service life from all Bosch products.

A refundable core charge must be applied to this alternator. Upon receipt of your rebuildable alternator core, you will be refunded the core charge.

This alternator has a rectagular connector on the back! Please check to ensure you are getting the correct alternator

This Bosch Alternator fits the following BMWs:
1998-2000 E39 5 Series 528i
2001-2003 E39 5 Series 525i & 530i
2001-2005 E46 3 Series 325i, 325Ci, 325xi - only for cars with M54 engine
2001-2005 E46 3 Series 330i, 330Ci & 330xi
2001-2002 Z3 Roadster Z3 2.5 liter
2003-2005 Z4 Roadster/Coupe Z4 2.5 liter & Z4 3.0 liter

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Wiring Harness - Engine Module - E39

T#:39592

Part#: 12511439175

Special Order: No Guaranteed ETA

3% off MSRP $ 765.99

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

$ 745.99 USD

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3% off MSRP

$ 765.99

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

$ 745.99 USD

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Genuine BMW Engine Wiring Harness, Engine Module -
This item fits the following BMW Chassis:
E39

Fits BMW Engines including:
M52

Genuine BMW Engine Oil Level Sensor - E38 E39

T#:359393

Part#: 12611406609

Back Ordered

Starting at $ 187.95 USD

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Starting at $ 187.95 USD

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This is the oil level sensor that installs into the bottom of the oil pan and controls the oil level warning light. We also recommend getting the oil level sensor o-ring.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
1997 E39 BMW 540i
1995-1997 E38 BMW 740i 740il 750il

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Crankshaft Pulse Generator - E39 540i, E53 X5, E38 740i

T#:14757

Part#: 12141433264

Special Order: No Guaranteed ETA

$ 115.99 USD

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$ 115.99 USD

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This is an OEM engine crankshaft position sensor that is mounted in the transmission bell housing. A faulty crankshaft sensor can be responsible for hard starting or long cranking times and overall poor driveability.

This item fits the following BMWs:
3/2000-2003 E39 BMW 540i
3/2000-2001 E38 BMW 740i 740il
2000-2003 E53 BMW X5 4.4i X5 4.6is

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Oil Temperature Sensor And Gauge Kit - Blue & Red - Multiple BMWs ...

10X Entries Into Our F80 M3 Sweepstakes

T#:401689

Part#: OILTEMPGAUGEBRKK

Back Ordered

Sale - Save 2% $ 196.99

This product was last offered at the strikethrough price on
05-03-2026

$ 193.26 USD

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Sale - Save 2%

$ 196.99

This product was last offered at the strikethrough price on
05-03-2026

$ 193.26 USD

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The EVO series from ProSport Gauges is an award winning, industry leading option for those looking to push their car's limits. They allowing you to monitor crucial engine functions in one quick glance with advanced precision. Featuring a dual color readout, you can customize your readout to your liking. Offering a user friendly readout with a digital reading in the center with a bar-graph style sweep around the gauge as well.

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Re-manufactured Starter Motor - Priced Each

T#:3471789

Part#: 124123547095KT

Back Ordered

$ 346.99

This product was last offered at the strikethrough price on
04-09-2026

$ 340.99 USD

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$ 340.99 USD

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Price Included a $40.00 Core Charge

Bosch Remanufactured Alternator - 150amp

For vehicles with liquid cooled alternator and production date from 09/1998

T#:371081

Part#: 12317508054BOSKT

Back Ordered

$ 1,167.99

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

$ 807.99 USD

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$ 807.99 USD

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Includes a $100.00 refundable core charge

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