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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.

This category contains parts that fit the following chassis:

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Alternator Pulley - Valeo Alternator only - URO
Alternator Pulley - Valeo Alternator only - URO
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:578905
Part#: 12317516105U
Ships in 1 Business Day
$ 34.99 USD
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$ 34.99 USD
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The solution to a noisy, failing pulley
URO Premium Upgraded Alternator Gasket - E63,E65
URO Premium Upgraded Alternator Gasket - E63,E65
2X Entries For Our G87 M2 Sweepstakes!
URO Premium - Corporate Logo
T#:587670
Part#: 12317507807
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$ 3.99 USD
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$ 3.99 USD
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Used to seal water cooled alternators
Hella Crankshaft Position Sensor - E36
Hella Crankshaft Position Sensor - E36
Hella - Corporate Logo
T#:14747
Part#: 12141247259
In Stock at Vendor
$ 89.99

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

$ 85.99 USD
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$ 85.99 USD
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OEM BMW PULSE GENERATOR
Alternator Bracket Bushing - Priced Each
Alternator Bracket Bushing - Priced Each
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URO - Corporate Logo
T#:592985
Part#: 12311715491
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$ 2.99 USD
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$ 2.99 USD
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Rubber bushing, placed in the top portion of the alternator support bracket. Each vehicle requires two.
Crankshaft Sensor O-Ring (18 X 1.2 Mm)
Crankshaft Sensor O-Ring (18 X 1.2 Mm)
Victor Reinz - Corporate Logo
T#:13233505
Part#: 12141402705
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$ 1.49 USD
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$ 1.49 USD
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This O-Ring can sometimes leak at the bottom of your engine and need to be replaced. Fits around the head of the lower crankshaft sensor and provides a connection point.
Bosch Knock Sensor - E31, E32, E34, E38
Bosch Knock Sensor - E31, E32, E34, E38
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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

$ 61.99 USD
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$ 61.99 USD
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Bosch BMW PING SENSOR:121060
Rein Relay
Rein Relay
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Rein - Corporate Logo
T#:381382
Part#: 61311378297
Back Ordered
$ 20.99 USD
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$ 20.99 USD
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Replacement relay for the typical white-green and orange relays found in your vehicle
Oil Level Sensor
Oil Level Sensor
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URO - Corporate Logo
T#:37858361
Part#: 12611406609
Ships in 1 Business Day
$ 124.99 USD
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$ 124.99 USD
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Is your oil level light on even though the oil level is fine? The issue may be a faulty oil level sensor, which monitors your engine’s oil level.
Boost Pressure Sensor
Boost Pressure Sensor
Hella - Corporate Logo
T#:840367
Part#: 13627585493
Ships in 2 Business Days
$ 153.99

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

$ 149.99 USD
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$ 149.99 USD
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Flasher/Hazard Light Relay
Flasher/Hazard Light Relay
Wehrle - Corporate Logo
T#:31522987
Part#: 61311371909
In Stock
$ 20.37

This product was last offered at the strikethrough price on
07-15-2026

$ 18.57 USD
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$ 18.57 USD
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URO Coolant Level Sensor - E24 E30 E32 E34
URO Coolant Level Sensor - E24 E30 E32 E34
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:593414
Part#: 61311378320
Ships in 1 Business Day
$ 17.99 USD
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$ 17.99 USD
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This sensor is critical in keeping tabs of your cooling system's health.
Oil Level Sensor
Oil Level Sensor
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URO - Corporate Logo
T#:8246791
Part#: 12617501786
Back Ordered
$ 59.99 USD
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$ 59.99 USD
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Replace your faulty sensor when the oil level light is on, but oils are at correct levels. Direct-fit OE replacement design restores factory oil level sensor function Easy plug-and-play connection Includes gasket
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Intensity Lithium-ION Battery - i34RX - 11.5lbs
Intensity Lithium-ION Battery - i34RX - 11.5lbs
Braille - Corporate Logo
T#:54388454
Part#: I34RX
Ships in 6 Business Days
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$ 949.99 USD
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$ 949.99 USD
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Whether you're building a dedicated track weapon or upgrading your street machine for ultimate reliability, unsprung and upper-chassis weight is the enemy of performance. Positioned high up in the engine bay or rear corners, a heavy factory battery negatively impacts your car's center of gravity.
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URO Engine Knock Sensor - BMW M62 S62 N62
URO Engine Knock Sensor - BMW M62 S62 N62
2X Entries For Our G87 M2 Sweepstakes!
URO - Corporate Logo
T#:43750207
Part#: 13627568421
Ships in 1 Business Day
$ 60.99 USD
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$ 60.99 USD
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This sensor recognizes pinging or knocking within the engine and adjusts timing accordingly to maintain proper engine function.
URO Camshaft Position Sensor - BMW E38 E39 E53 E52 M62 4.4L 4.6L 4.8L
URO Camshaft Position Sensor - BMW E38 E39 E53 E52 M62 4.4L 4.6L 4.8L...
2X Entries For Our G87 M2 Sweepstakes!
URO - Corporate Logo
T#:43446144
Part#: 12147539166
In Stock
$ 19.99 USD
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$ 19.99 USD
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When this sensor fails, it will become impossible to start your car, leaving you stranded. Get your BMW back up and running with this brand sensor from URO.
15A Fuse - Priced Each
15A Fuse - Priced Each
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:375327
Part#: 61131372626
In Stock at Vendor
$ 2.03 USD
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$ 2.03 USD
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Valeo Alternator - E53
Valeo Alternator - E53
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Valeo - Corporate Logo
T#:377182
Part#: 12317540994
In Stock
$ 384.99 USD
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$ 384.99 USD
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Restore charging system voltage with a new alternator
AUTOTECKNIC Dry Carbon Fiber Battery Terminal Cover - G87 M2
AUTOTECKNIC Dry Carbon Fiber Battery Terminal Cover - G87 M2 ...
AUTOTECKNIC - Corporate Logo
T#:21012623
Part#: ATK-BM-0420-G87
Ships in 7 Business Days
$ 495.00 USD
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$ 495.00 USD
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The boldly styled G87 already touts carbon features but carbon fiber is not very often displayed in the engine bay. If you are looking to give your engine bay some carbon spark, AUTOTECKNIC introduces you to their dry carbon battery terminal cover to beautify your engine bay and bring a smile to your face every time you open the hood of your S58 monster! Made from high-quality carbon, this product is sure to stand the test of time!
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Brake Switch - 4 Prong
Brake Switch - 4 Prong
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:373217
Part#: 61318360417
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$ 15.52 USD
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$ 15.52 USD
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Located on the brake pedal, this switch is vital to your brake light function. In the event that your vehicle's brake lights are not working and simultaneously showing a "brake light circuit failure", you should replace this part.
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120 pc Fuse Assortment
120 pc Fuse Assortment
Performance Tool - Corporate Logo
T#:1809154
Part#: W5368
In Stock
$ 13.68 USD
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$ 13.68 USD
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A must for any toolbox.
ReFlex Lite Injector Harness - V8
ReFlex Lite Injector Harness - V8
Motiv Motorsports - Corporate Logo
T#:29234314
Part#: 900.1014
Ships in 5 Business Days
$ 295.00 USD
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$ 295.00 USD
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Required when installing a Motiv ReFlex Lite to your V8 powered BMW! Includes x8 injector leads and direct, plug-in adapter to the ReFlex Lite Control Unit!
Battery Tender Plus Advanced Battery Charging System
Battery Tender Plus Advanced Battery Charging System
Battery Tender - Corporate Logo
T#:49892371
Part#: BTT0210128
Back Ordered
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$ 69.99 USD
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$ 69.99 USD
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Alternator
Alternator
We Price Match - Give Us A Call or Chat!
Valeo - Corporate Logo
T#:594100
Part#: 12317561002
In Stock at Vendor
$ 794.99

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

$ 771.99 USD
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$ 771.99 USD
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The alternator in your vehicle keeps the battery at full charge when your engine is running. Because all of your electronic systems run off of this small piece, it's important that it is operational. If your lights are dim while driving or your battery dies within minutes of starting your car, it's time for a new alternator.
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ReFlex Lite: Advanced Sequential Injector Controller - V8
ReFlex Lite: Advanced Sequential Injector Controller - V8
Motiv Motorsports - Corporate Logo
T#:29234300
Part#: 910.1012
Ships in 5 Business Days
$ 499.00 USD
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$ 499.00 USD
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The ReFlex LITE is a simple yet elegant fueling solution for direct injected vehicles that need to add more fuel by installing a port injection system to keep up with their modifications to the vehicle. Using the same precise form of sequential fuel injection as the ReFlex+, the ReFlex LITE brings a more affordable fuel controller without the additional features of the ReFlex+. Sequential port fuel injection for v-8 engines Firmware and maps are available for multiple vehicles FREE on our website High resolution calibration tables 24x24 cell RPM vs MAP 0-48psi MAP pressure range 250RPM increments up to 8500RPM High resolution datalogging Fault detection status available to monitor in TunerPRO RT Compact in size Universal fitment Simple installation Please Note: The ReFlex LITE does NOT have the ability to analyze and transmit ethanol content to an ECU.
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ReFlex+ Plug-N-Play Harness Kit - Visconti Tuning
ReFlex+ Plug-N-Play Harness Kit - Visconti Tuning
Motiv Motorsports - Corporate Logo
T#:29201087
Part#: 200.1103
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$ 615.00 USD
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$ 615.00 USD
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Visconti Tuning teamed up with MOTIV as the first company to bring a plug-and-play harness to the community. After years of success and some of the fastest Supras and BMWs in the world using the harness, Visconti Tuning has improved upon an already fantastic offering.
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OEM Bosch Starter Relay - E21 320i
OEM Bosch Starter Relay - E21 320i
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:583822
Part#: 61311243207
In Stock at Vendor
$ 4.99 USD
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$ 4.99 USD
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This is a brand new starter relay from OEM supplier Bosch. If you have replaced your starter and have ruled out every other issue, this relay could restore your starters operation and get your car back up and running.
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Hitachi Engine Crankshaft Position Sensor - BMW F2X F3X
Hitachi Engine Crankshaft Position Sensor - BMW F2X F3X
Hitachi - Corporate Logo
T#:48850074
Part#: 13627582842
Ships in 6 Business Days
$ 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 - BMW E9X F3X F8X N20 N52 N55 S55
Hitachi Camshaft Position Sensor - BMW E9X F3X F8X N20 N52 N55 S55 ...
Hitachi - Corporate Logo
T#:48815454
Part#: 13627525014
Ships in 6 Business Days
$ 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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Walker MAP Sensor - BMW N20 N26 S55 S63
Walker MAP Sensor - BMW N20 N26 S55 S63
Walker - Corporate Logo
T#:39059258
Part#: 13627843531
In Stock at Vendor
$ 163.99

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

$ 135.99 USD
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$ 135.99 USD
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This is a replacement Manifold Absolute Pressure sensor Located on the charge air cooler. The MAP controls the amount of fuel that goes through the injectors based on the pressure of air at the intake manifold. If your vehicle is giving you a MAP code, replace it immediately to ensure you get the best gas mileage and performance. It is common for this part to fail slowly and cause poor fuel mileage and hampered performance. When it fails, the vehicle will stutter and stall as it falls into a limp mode. One way to check if your MAP is bad is to unplug the connector before starting your car. If it idles well (compared to a previous poor idle), your MAP sensor likely needs to be replaced. If you let this maintenance part go, your fuel economy will suffer as too much fuel is going into the engine and not being burned. A great way to give your vehicle an efficiency boost.
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Battery Cable - With Pole
Battery Cable - With Pole
Bapmic - Corporate Logo
T#:54388517
Part#: 61129259425
Ships in 2 Business Days
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$ 126.99 USD
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$ 126.99 USD
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On the track or on the street, your BMW’s electrical architecture demands absolute consistency. A degraded positive battery cable introduces unwanted resistance, leading to weak starts, alternator strain, and erratic module behavior. When it’s time to replace a compromised factory cable, you don’t need over-hyped marketing—you need a part that fits precisely and restores factory grid integrity.
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Hitachi Engine Camshaft Position Sensor - BMW S63M N63B/N63M/N63R S68X/S68T
Hitachi Engine Camshaft Position Sensor - BMW S63M N63B/N63M/N63R S68...
Hitachi - Corporate Logo
T#:48850059
Part#: 13628697982
Ships in 6 Business Days
$ 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 Crankshaft Sensor - BMW B46 B48 B58
Hitachi Crankshaft Sensor - BMW B46 B48 B58
Hitachi - Corporate Logo
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.
Hitachi Engine Crankshaft Position Sensor - BMW N52 N54 S85 S65 S63
Hitachi Engine Crankshaft Position Sensor - BMW N52 N54 S85 S65 S63 ...
Hitachi - Corporate Logo
T#:48815471
Part#: 13627525015
Ships in 6 Business Days
$ 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 Camshaft Position Sensor - Intake - BMW M52TU M54
Hitachi Camshaft Position Sensor - Intake - BMW M52TU M54
Hitachi - Corporate Logo
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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Temperature Sensor
Temperature Sensor
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:29898445
Part#: 13621362599
Ships in 2 Business Days
$ 283.99

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

$ 266.99 USD
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$ 266.99 USD
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Genuine BMW Temperature-Time Switch
Mishimoto Ignition Coil - Single - BMW M54, N20, N52, N54, N55, N62, S54, S62
Mishimoto Ignition Coil - Single - BMW M54, N20, N52, N54, N55, N62, ...
Mishimoto - Corporate Logo
T#:51075090
Part#: MMIG-BMW-02
Ships in 3 Business Days
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$ 72.99 USD
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$ 72.99 USD
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The Mishimoto BMW Ignition Coil is built to handle the intense heat cycles found in BMW’s modern turbocharged and naturally aspirated engines.
Vargas MAP Sensor Extension Harness - BMW B58, N54, N55, S55, S58, S63
Vargas MAP Sensor Extension Harness - BMW B58, N54, N55, S55, S58, S6...
Vargas Turbo Technologies - Corporate Logo
T#:51672717
Part#: VTT-MAP-HARNESS
Ships in 10 Business Days
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$ 59.99 USD
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$ 59.99 USD
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As part of the VTT-FAB fabrication line, this extension harness is designed for builders and tuners who need flexibility.
Denso Starter Motor - BMW N55 S55 3.0L
Denso Starter Motor - BMW N55 S55 3.0L
Denso - Corporate Logo
T#:40004863
Part#: 12417631559
Ships in 2 Business Days
$ 461.99

This product was last offered at the strikethrough price on
05-04-2026

$ 390.99 USD
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$ 390.99 USD
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If your car won't turn over, there is a good chance your starter is shot. Denso's OEM starter is a high quality replacement that will give you peace of mind thanks to its long life-span.
MINI Alternator - SEG Automotive 0125.711.078
MINI Alternator - SEG Automotive 0125.711.078
SEG Automotive - Corporate Logo
T#:54851993
Part#: 12317613445
Ships in 2 Business Days
New Item
$ 564.99

This product was last offered at the strikethrough price on
07-16-2026

$ 509.99 USD
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$ 509.99 USD
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Hitachi Camshaft Position Sensor - E39, E46, E53, E60, E63, E64, E65, E66, E83, Z3, Z4
Hitachi Camshaft Position Sensor - E39, E46, E53, E60, E63, E64, E65,...
Hitachi - Corporate Logo
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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BMW Starter - SEG Automotive 0001.108.460
BMW Starter - SEG Automotive 0001.108.460
SEG Automotive - Corporate Logo
T#:55857741
Part#: 12417610344
Ships in 2 Business Days
New Item
$ 368.99

This product was last offered at the strikethrough price on
07-16-2026

$ 330.99 USD
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$ 330.99 USD
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BMW Alternator - SEG Automotive 0124.525.588
BMW Alternator - SEG Automotive 0124.525.588
SEG Automotive - Corporate Logo
T#:54851984
Part#: 12317541694
Ships in 2 Business Days
New Item
$ 521.99

This product was last offered at the strikethrough price on
07-16-2026

$ 468.99 USD
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$ 468.99 USD
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MINI Alternator - SEG Automotive 0124.325.157
MINI Alternator - SEG Automotive 0124.325.157
SEG Automotive - Corporate Logo
T#:54851988
Part#: 12317550319
Ships in 2 Business Days
New Item
$ 473.99

This product was last offered at the strikethrough price on
07-16-2026

$ 430.99 USD
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$ 430.99 USD
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Remanufactured Starter Motor
Remanufactured Starter Motor
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:596907
Part#: 12417501738
Ships in 2 Business Days
$ 431.15

This product was last offered at the strikethrough price on
08-13-2026

$ 300.49 USD
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$ 300.49 USD
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If your starter has died and your car will no longer turner over, Bosch's replacement unit is the perfect high quality replacement. OEM replacement for BMW part # 12417501738.
Alternator - 220 Amp
Alternator - 220 Amp
We Price Match - Give Us A Call or Chat!
Valeo - Corporate Logo
T#:639716
Part#: 12317804266
In Stock at Vendor
$ 822.99

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

$ 799.99 USD
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$ 799.99 USD
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Vargas Coolant Level Extension Harness - BMW B48/B58/S58
Vargas Coolant Level Extension Harness - BMW B48/B58/S58
Vargas Turbo Technologies - Corporate Logo
T#:51813310
Part#: VTT-FAB-HC
Ships in 10 Business Days
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$ 49.99 USD
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$ 49.99 USD
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Simplify your next fabrication project with the VTT-FAB series Coolant Extension Harness.
Vargas Plug & Play Pre And Post Throttle MAP Sensor Kit - 6B 4W - BMW B58/S55/S58
Vargas Plug & Play Pre And Post Throttle MAP Sensor Kit - 6B 4W - BMW...
Vargas Turbo Technologies - Corporate Logo
T#:52129729
Part#: VTT56BSENSKIT64
Ships in 10 Business Days
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$ 209.99 USD
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$ 209.99 USD
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The VTT 6-Bar MAP sensor kit provides the necessary overhead to monitor boost levels with a linear voltage scale that makes software calibration straightforward.
BMW Alternator - SEG Automotive 0124.515.223
BMW Alternator - SEG Automotive 0124.515.223
SEG Automotive - Corporate Logo
T#:54851980
Part#: 12317519618
Ships in 2 Business Days
New Item
$ 503.99

This product was last offered at the strikethrough price on
07-16-2026

$ 453.99 USD
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$ 453.99 USD
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OEM Bosch Remanufactured Alternator - 180 Amp - E70 X5 3.0si N52 3.0L
OEM Bosch Remanufactured Alternator - 180 Amp - E70 X5 3.0si N52 3.0L...
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Bosch - Corporate Logo
T#:638550
Part#: 12317560986-14KT
Ships in 2 Business Days
$ 1,097.99 USD
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$ 1,097.99 USD
Free Shipping on orders $49 and up
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Replace your dead alternator with this remanufactured unit and make sure your battery is being charged properly. When doing any sort of repair or maintenance there is no replacement for original parts. Turner Motorsport carries the OEM Bosch brand with pride and has the parts you need to complete your next project with confidence. Includes a $75.00 core charge to be refunded after we receive your refundable core.
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Hitachi Voltage Regulator - BMW E88 N52
Hitachi Voltage Regulator - BMW E88 N52
Hitachi - Corporate Logo
T#:48815477
Part#: 12317550469
Ships in 6 Business Days
$ 79.99 USD
Free Shipping on orders $49 and up
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$ 79.99 USD
Free Shipping on orders $49 and up
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Supplies power to your car's electronics and recharges the battery.

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