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BMW Electrical Sensors, Switches, & Relays for BMW Z4 M Roadster S54 (2003-2008)

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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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Genuine BMW Oil Level Sensor - Multiple BMWs

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T#:13104

Part#: 12617607910

In Stock

14% off MSRP $ 298.81

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

$ 257.99 USD

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14% off MSRP

$ 298.81

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

$ 257.99 USD

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This is the oil level sensor / sender for BMW E9X E53 E65 E70 E71 E82 E83 When this part fails it will illuminate a check light on the dash which indicates it needs to be replaced. Includes o-ring.

OEM Starter Motor - E46 M3 2001-2006

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T#:2988

Part#: 12417835735

In Stock

$ 400.99

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

$ 293.99 USD

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$ 293.99 USD

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This is the starter motor for BMW E46 M3 2001-2006 is an OEM Valeo unit.

This item fits the following BMWs:
2001-2006 E46 BMW M3. M3 Convertible
2001-2002 Z3 BMW Z3 M Roadster Z3 M Coupe
2005-2008 E85 BMW Z4 M Roadster Z4 M Coupe

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DSC Pressure Sensor

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T#:567281

Part#: 34521164458

In Stock

$ 152.99 USD

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$ 152.99 USD

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This sensor is attached to the brake master cylinder

FAE Exhaust Camshaft Position Sensor

Sensor for the exhaust camshaft

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T#:1196088

Part#: 13627796054

In Stock

$ 74.99 USD

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$ 74.99 USD

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Located on rear of the cylinder head, sensing the exhaust cam

Genuine BMW Exhaust Camshaft Position Sensor - E46 M3, E39 M5, MZ3, M...

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T#:1445

Part#: 13627796054

Ships in 2 Business Days

7% 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.

$ 271.99 USD

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7% 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.

$ 271.99 USD

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Sensor for: Exhaust. One weak point on BMW engines for years has been the cam position reference sensor. On the S54 engine in the E46 M3, M Roadster, and Z4M, there is one sensor for each cam. The sensor tells the computer the position of the cam on cylinder #1. The computer relies on the sensor's information to set injection timing and VAN0S control. When a sensor goes bad, the computer loses track of what position the cam is in. While the engine will continue to run (taking its measurements from the crank position sensor), the entire system is thrown off. The engine may stumble or run rough, but not misfire, and there will be a loss of performance. Each cam sensor also doubles as a sensor for the VAN0S. So when the sensor goes bad, the VAN0S will revert to a safe mode and will not advance.

While the engine will still run with a faulty cam position sensor, it's not running in its finest tune. The DME will have fault codes related to the cam sensor or for the VAN0S. This is the Original BMW sensor with a new 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:
2001-2006 E46 BMW M3
1997-2003 E39 BMW M5
2001-2002 Z3 BMW M Roadster M Coupe
2006-2008 E85 BMW Z4 M Roadster M Coupe
2000-2003 E52 BMW Z8 Roadster

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Genuine BMW Intake Camshaft Sensor - E46 M3, MZ3, Z4 M

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T#:351

Part#: 12147539171

Ships in 2 Business Days

6% off MSRP $ 247.99

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

$ 231.99 USD

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6% off MSRP

$ 247.99

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

$ 231.99 USD

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Sensor for: Intake. A common failure - On the S54 engine in the E46 M3, M Roadster, and Z4M, there is one sensor for each cam. The sensor tells the computer the position of the cam on cylinder #1. The computer relies on the sensor's information to set injection timing and VAN0S control. When a sensor goes bad, the computer loses track of what position the cam is in. While the engine will continue to run (taking its measurements from the crank position sensor), the entire system is thrown off. The engine may stumble or run rough, but not misfire, and there will be a loss of performance.

Each cam sensor also doubles as a sensor for the VAN0S. So when the sensor goes bad, the VAN0S will revert to a safe mode and will not advance.

While the engine will still run with a faulty cam position sensor, it's not running in its finest tune. The DME will have fault codes related to the cam sensor or for the VAN0S. This is the Original BMW sensor with a new o-ring.

Applications:
2001-2006 E46 M3, M3 CSL
2006-current E85 Z4 M Roadster, E86 Z4 M Coupe
2001-2002 MZ3 M Roadster, M Coupe (S54 engine only)

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Bosch Remanufactured Starter - E46 M3, S54

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T#:373451

Part#: 12417835735KTBOS

Ships in 6 Business Days

$ 366.99 USD

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$ 366.99 USD

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This starter offers reliable performance at a fraction of the cost of a new unit, providing peace of mind and ensuring your BMW starts smoothly every time. This remanufactured starter from Bosch will allow your car to start like it is new. Includes $70 core charge.

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Alternator - 150 Amp - Valeo

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T#:579634

Part#: 439590

In Stock

$ 620.35

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

$ 518.99 USD

Limited Qty Sale

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$ 620.35

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

$ 518.99 USD

Limited Qty Sale

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Valeo Brand New Alternator - E89 Z4 M Coupe/Roadster

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T#:379218

Part#: 12317837691KT

Ships in 5 Business Days

$ 378.99 USD

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$ 378.99 USD

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This is a brand new Valeo alternator. BMW Alternators are built especially for extremes of heat, cold and high demand. Your BMW deserves nothing less than the best, which is why an OEM Valeo alternator is the best option. BMW alternators are built to last using the highest quality materials and the most technologically advanced processes. All alternator parts are 100% factory tested to assure that they meet or exceed original equipment specifications. And every alternator is fully load tested to guarantee compliance with BMW's strict performance specifications.

No core charge!

Fits the following BMW Chassis:

E89 BMW Z4 M Coupe, M Roadster

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Genuine BMW Rep. Wire For B+ - 61139321691 - E82,E89,E90,E92,E93 ...

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T#:186024

Part#: 61139321691

In Stock

3% off MSRP $ 147.99

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

$ 143.99 USD

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3% off MSRP

$ 147.99

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

$ 143.99 USD

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Genuine BMW Rep. Wire For B+
This item fits the following BMW Chassis:
E82 1M Coupe,E82,E89 Z4,E90,E92,E93

Genuine BMW Crank Shaft Speed Sensor - S54

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T#:14788

Part#: 12147830789

Ships in 2 Business Days

6% off MSRP $ 292.99

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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6% off MSRP

$ 292.99

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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Genuine BMW Speed Sensor
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

Genuine BMW Knock Sensor - S54 3.2L

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T#:38666

Part#: 12147839167

In Stock at Vendor

13% off MSRP $ 87.99

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

$ 76.99 USD

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13% off MSRP

$ 87.99

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

$ 76.99 USD

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Genuine BMW Ping Sensor
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

Base B+ - 2X - E46, Z4

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T#:141099

Part#: 61138387546

Ships in 5 Business Days

3% off MSRP $ 61.99

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

$ 59.99 USD

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3% off MSRP

$ 61.99

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

$ 59.99 USD

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Genuine BMW Base B+ - 2X
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Genuine BMW PDC Sensor

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T#:14180

Part#: 66206989068

Ships in 5 Business Days

$ 141.99 USD

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$ 141.99 USD

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Genuine BMW Ultrasonic-Sensor - Schwarz
This item fits the following BMW Chassis:
E39 M5,E85 Z4M,E53 48IS,E39,E53 X5,E85 Z4,E86 Z4

Genuine BMW Remanufactured Alternator - E89 Z4 M Coupe/Roadster ...

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T#:372415

Part#: 12317837691KT

Ships in 1-2 days

$ 1,058.99 USD

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$ 1,058.99 USD

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This is a Genuine BMW remanufactured alternator. BMW Alternators are built especially for extremes of heat, cold and high demand. Your BMW deserves nothing less than the best, which is why an Original Equipment Alternator is the best option. BMW alternators are built to last using the highest quality materials and the most technologically advanced processes. All alternator parts are 100% factory tested prior to and during remanufacturing to assure that they meet or exceed original equipment specifications. And every alternator is fully load tested to guarantee compliance with BMW's strict performance specifications.

A $50 core charge is included in the price. Upon receipt of your rebuildable alternator core, you will be refunded the core charge.

Fits the following BMW Chassis:
E89 BMW Z4 M Coupe, M Roadster

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Genuine BMW Fuse Box - 61148384629 - E85

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T#:141234

Part#: 61148384629

Ships in 4 Business Days

4% off MSRP $ 692.99

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

$ 665.99 USD

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4% off MSRP

$ 692.99

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

$ 665.99 USD

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Genuine BMW Fuse Box
This item fits the following BMW Chassis:
E85 Z4M,E85 Z4,E86 Z4

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