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BMW Electrical Sensors, Switches, & Relays for BMW Z3 (1996-2002)

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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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New Alternator - 120A

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:25042543

Part#: 12317501690

Ships on Sep 15, 2026

Sale - Save 20% $ 211.99

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

$ 169.59 USD

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Sale - Save 20%

$ 211.99

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

$ 169.59 USD

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Bav Auto Camshaft Position Sensor - BMW E36 E39 Z3 M52 S52

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:639841

Part#: 12141703221

In Stock

Sale - Save 20% $ 37.99

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

$ 30.39 USD

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Sale - Save 20%

$ 37.99

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

$ 30.39 USD

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Faulty camshaft sensors can lead to a number of issues such as hard starts, stalling at low speeds, and check engine (SES) lights. Restore your BMW's smooth operation and reliability by replacing it with a high-quality camshaft sensor from Bav Auto! From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Alternator - 120amp

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:25042542

Part#: 12317831436

Ships on Sep 21, 2026

Sale - Save 20% $ 222.99

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

$ 178.39 USD

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Sale - Save 20%

$ 222.99

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

$ 178.39 USD

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

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:48850055

Part#: 12147518628

Ships in 2 Business Days

$ 71.99 USD

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$ 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

For vehicles with production date from 09/1998

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:48850072

Part#: 12147539165

In Stock at Vendor

$ 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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Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:639833

Part#: 13621433076

In Stock

Sale - Save 20% $ 14.99

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

$ 11.99 USD

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Sale - Save 20%

$ 14.99

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

$ 11.99 USD

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This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Hitachi Crankshaft Position Sensor - BMW M52 S52 M54

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:48815470

Part#: 12141709616

Back Ordered

$ 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 Voltage Regulator - BMW E36 Z3 E34

For 115A Valeo alternators

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:48850070

Part#: 12321739435

Back Ordered

$ 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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Electrical System
- Alternator (2)
- Sensors (5)

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