BMW Electrical Sensors, Switches, & Relays for BMW 8 Series E31 (1991-1997)

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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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ECS - Corporate Logo
T#:49996974
Part#: 059235LA01
In Stock
New Item
Sale - Save 20% $ 29.99

This product was last offered at the strikethrough price on
06-14-2026

$ 23.99 USD
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Sale - Save 20%
$ 29.99

This product was last offered at the strikethrough price on
06-14-2026

$ 23.99 USD
Free Shipping

If you're experiencing hard starting, flaky charging, or other electrical issues, your engine ground strap may be the culprit. On older BMWs, the engine ground strap is a thin, non-insulated cable that spans from the engine mount arm to the frame horn. Despite the seemingly simple nature of this part, on older cars, it is known to cause massive headaches. Due to its non-insulated design, years of exposure to water, dirt, and road salt will cause the wire to corrode, ultimately leading to complete failure. A break in this cable will cause an open circuit, resulting in issues with the vehicle's electrical system and potentially leading to a no-start condition.

To solve this issue, ECS has engineered an exact-fit, upgraded ground strap for your BMW! Unlike its OEM counterpart, this design features insulated, large-gauge copper wire for dependable conductivity and long-lasting durability. Additionally, factory-style lugs are zinc-coated, crimped, and soldered, ensuring protection against corrosion and oxidation.

Whether you're replacing a visibly corroded strap or proactively preventing failure, this solution from ECS is sure to provide lasting performance and protection.

FEATURES

Direct-fit replacement and upgrade for E30 (318i/is), E36, E39, E46, and others Solves intermittent grounding issues caused by aging OEM straps Clean, stealthy design that fits seamlessly in factory engine bays Factory length and lug orientation for drop-in fitment 2 AWG tinned copper cable for excellent conductivity and corrosion resistance Zinc-coated lugs, crimped and soldered to resist moisture and oxidation Black UL1015-grade insulation withstands oil, heat, and abrasion Discreet ECS label for a clean, OEM+ look Replaces OEM part numbers 12421737755 and 12421714262.

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Genuine BMW - Corporate Logo
T#:20278
Part#: 61321383365
Ships in 3 Business Days
3% off MSRP $ 114.99

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

$ 111.99 USD
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3% off MSRP
$ 114.99

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

$ 111.99 USD
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This is the ignition switch with harness for the E36 3 series thru 1/1995. If replacing the ignition lock cylinder you may want to check the harness to ensure it is functioning properly.
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:
1992-1/1995 E36 BMW 318i 318is 318ic 325i 325is 325ic M3
1990-1999 E31 BMW 840i 840ci 850i 850ci 850csi
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OEM Bosch BMW Knock Sensor - M62 E39 E38 E31
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:397564
Part#: 12141741648
In Stock
$ 64.99 USD
Free Shipping
$ 64.99 USD
Free Shipping

Knock sensors detect pings in the engine and adjust ignition timing to restore perfect operation. Faulty knock sensors will throw engine codes or even lead to engine damage. Replace your sensor with a reliable, high quality Bosch sensor to ensure proper engine ignition timing.

Bosch # 12141741648 OEM replacement for BMW part # 12141741648.

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 s  eupplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their quality, high durability, and reliability, you should expect a long service life from Bosch products.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

Fits the following vehicles:
1996-09/1999 E39 BMW 540i
1995-09/1999 E38 BMW 740i 740iL
1990-1999 E31 BMW 840Ci

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Bosch Knock Sensor - E31, E32, E34, E38
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:579188
Part#: 261231074
In Stock at Vendor
$ 111.99

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

$ 108.00 USD
Free Shipping
$ 108.00 USD
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Controls the timing and air/fuel mixture of your engine

Bosch Alternator - 1993-1995 V8 - E34 530i/540i & E32 740i/740il ...
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:1976
Part#: AL0742X
In Stock at Vendor
$ 475.99

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

$ 464.99 USD
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$ 464.99 USD
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Replacement Bosch alternator for the 1993-1995 V8 engine (M60), found in the E34 530i & 540i, and E32 740i/740iL (thru 1994). 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.

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 Bosch Alternator fits the following BMWs:
1994-1995 E34 5 Series V8 530i & 540i
1992-1995 E32 7 Series V8 740i & 740iL
1994-1995 E31 8 Series V8 840C/ 840i

Includes $65.00 core charge to be refunded on return of your rebuildable core.

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Genuine BMW - Corporate Logo
T#:367859
Part#: 13627839138
Ships in 3 Business Days
6% off MSRP $ 296.99

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

$ 279.99 USD
Free Shipping
6% off MSRP
$ 296.99

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

$ 279.99 USD
Free Shipping

OMP - Corporate Logo
T#:1614
Part#: EA-462
In Stock
$ 65.00 USD
Free Shipping
$ 65.00 USD
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OMP Battery Cut Off Switch / Kill Switch, for use in racecars as an emergency "kill switch", to depower the electrical system in the event of a crash or other emergency. This cut off switch is FIA approved, has 6 poles and alternator protection, as well as a removable key.
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Bosch Alternator - 120 Amp - E31 E38 E39
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:186964
Part#: AL0733X
In Stock
$ 496.99

This product was last offered at the strikethrough price on
02-14-2026

$ 319.99 USD
Free Shipping
$ 319.99 USD
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120 amp Bosch alternator for many BMW M62 V8's with 7 Poly Groove Pulley. 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. Can be used in place of bmw part number. 12311433266

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 Bosch Alternator fits the following BMWs:
1997-1998 E39 5 Series 540i
1997-1998 E38 BMW 740i 740il
1996-1999 E31 BMW 840i 840ci

Includes $65.00 core charge to be refunded on return of your rebuildable core.

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Genuine BMW - Corporate Logo
T#:463598
Part#: 61318360459
Ships in 3 Business Days
4% off MSRP $ 69.99

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

$ 66.99 USD
Free Shipping
4% off MSRP
$ 69.99

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

$ 66.99 USD
Free Shipping

Genuine BMW - Corporate Logo
T#:179854
Part#: 12141729292
Ships in 3 Business Days
6% off MSRP $ 222.99

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

$ 209.99 USD
Free Shipping
6% off MSRP
$ 222.99

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

$ 209.99 USD
Free Shipping

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.


Genuine BMW Crankshaft Speed Sensor -
This item fits the following BMW Chassis:
E38

Fits BMW Engines including:
M60
 

 

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Genuine BMW - Corporate Logo
T#:10637
Part#: 61361388533
Ships in 1-2 days
2% off MSRP $ 149.00

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

$ 145.99 USD
Free Shipping
2% off MSRP
$ 149.00

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

$ 145.99 USD
Free Shipping


Genuine BMW Hazard Warning Relay
This item fits the following BMW Chassis:
E36 M3,E36

Genuine BMW - Corporate Logo
T#:144148
Part#: 61358364691
Ships in 3 Business Days
3% off MSRP $ 144.99

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

$ 140.99 USD
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3% off MSRP
$ 144.99

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

$ 140.99 USD
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Genuine BMW Crash Alarm Relay
This item fits the following BMW Chassis:
E36 M3,E34 M5,E34,E36



Genuine BMW - Corporate Logo
T#:367791
Part#: 12141742185
Ships in 3 Business Days
6% off MSRP $ 290.99

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

$ 273.99 USD
Free Shipping
6% off MSRP
$ 290.99

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

$ 273.99 USD
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This cam position sensor provides input to the ECU. It fits BMW e39 540i E38 740i 740il E31 840ci 1997-1998.
Genuine BMW - Corporate Logo
T#:174334
Part#: 12141720291
Ships in 1-2 days
5% off MSRP $ 203.99

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

$ 192.99 USD
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5% off MSRP
$ 203.99

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

$ 192.99 USD
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Genuine BMW PULSE GENERATOR
Fits BMW Engines including:
M70,S70

Genuine BMW - Corporate Logo
T#:187280
Part#: 12121725020
Ships in 3 Business Days
6% off MSRP $ 252.99

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

$ 238.99 USD
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6% off MSRP
$ 252.99

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

$ 238.99 USD
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Genuine BMW Pulse Generator
Fits BMW Engines including:
M70,S70


Genuine BMW - Corporate Logo
T#:39686
Part#: 12511732156
Ships in 8 Business Days
3% off MSRP $ 267.99

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

$ 258.99 USD
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3% off MSRP
$ 267.99

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

$ 258.99 USD
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This is the lower engine wiring harness which connects to the secondary alternator. If you are experiencing rough running conditions, failure to start, failure of the charging system or any other erratic electrical system behavior, it may be time to replace your engine wiring harnesses. Genuine BMW WIRING-ADDITIONAL ALTERNATOR Fits BMW Engines including: M70
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Bosch Starter Motor - E39 E38 E32 E34 X5 E53
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:2024
Part#: SR0446X
Ships on Aug 14, 2026
$ 477.99 USD
Free Shipping
$ 477.99 USD
Free Shipping

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.

This genuine Bosch Starter motor fits the following BMWs:
1992-1994 E32 7 Series 740i, 740il
1993-1995 E34 5 Series 530i, 530i wagon, 540i
1995-2001 E38 7 Series 740i, 740il
1997-2003 E39 5 Series 540i M5
2000-2003 E53 X5 X5 4.4i X5 4.6is - M62 engine
2000-2003 Z8 Z8

 

Includes $100.00 core charge to be refunded on return of your rebuildable core.

 

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Bosch Knock Sensor - E31, E32, E34, E38
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:13073
Part#: 12141702163
In Stock at Vendor
$ 78.99

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

$ 76.99 USD
Free Shipping
$ 76.99 USD
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Bosch BMW PING SENSOR:121060

Genuine BMW - Corporate Logo
T#:367846
Part#: 13621702078
Ships in 3 Business 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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Genuine BMW - Corporate Logo
T#:13080
Part#: 12311741138
Ships in 9 Business Days
3% off MSRP $ 1,637.99

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

$ 1,585.99 USD
Free Shipping
3% off MSRP
$ 1,637.99

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

$ 1,585.99 USD
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Genuine BMW At-Compact Alternator - 140A
This item fits the following BMW Chassis:
E38,E39

Fits BMW Engines including:
M60,M62,M73,M73N


Genuine BMW - Corporate Logo
T#:52323
Part#: 24637508670
Ships in 9 Business Days
3% off MSRP $ 260.99

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

$ 252.99 USD
Free Shipping
3% off MSRP
$ 260.99

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

$ 252.99 USD
Free Shipping


Genuine BMW Cable Harness -
This item fits the following BMW Chassis:
E34


Genuine BMW - Corporate Logo
T#:40287
Part#: 12521724261
Ships in 9 Business Days
2% off MSRP $ 123.99

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

$ 120.99 USD
Free Shipping
2% off MSRP
$ 123.99

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

$ 120.99 USD
Free Shipping
Genuine BMW BASE B+
Fits BMW Engines including:
M70,M73,S70