BMW Electrical Sensors, Switches, & Relays for BMW E90 M3 S65 4.0L

Clear BMW chassis

Please ensure your correct model is selected

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.

Sub-Categories

Sort By:
Turner E9x Cowl Delete Kit
Turner E9x Cowl Delete Kit
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:1809115
Part#: 007629LA09KT
In Stock
Sale - Save 25% $ 420.95

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

$ 315.71 USD
Free Shipping
Add to Wish List
Sale - Save 25%
$ 420.95

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

$ 315.71 USD
Free Shipping
Add to Wish List
Get rid of all your plastic in your engine bay for a cleaner look! Completely eliminates the bulky, obtrusive cabin filter housing for more room underhood - offering more room to access the engine. Compliment your engine bay and hide away the exposed ECU.
Show More Show Less
Turner ECU/ Brake Master Cover Set - E9x
Turner ECU/ Brake Master Cover Set - E9x
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:1809112
Part#: 007629LA03
In Stock
Sale - Save 25% $ 178.99

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

$ 134.24 USD
Free Shipping
Add to Wish List
Sale - Save 25%
$ 178.99

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

$ 134.24 USD
Free Shipping
Add to Wish List
Our ECU Cover incorporates beauty with OE function. Designed in-house by our industry leading engineering staff, the E9x Turner ECU Cover incorporates beauty with OE function. Made from a heat resistant, textured matte black polymer material, this cover is sure to be turning heads! This cover gives your engine bay the look it should have came with from the factory and hides away the exposed ECU while helping protect it from the elements. We provide a simple cover that installs directly on top of the ECU bracket for an OEM plus look! Installation is a breeze, simply remove screws from the ECU bracket on either side, line up the ECU cover, and hand tighten the screws back on. Add a flash of style and elegance under your hood with our ECU Cover!
Show More Show Less
Turner Cowl Delete Harness Mounting Bracket - E9x
Turner Cowl Delete Harness Mounting Bracket - E9x
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:1809114
Part#: 007629LA02
In Stock
Sale - Save 25% $ 143.99

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

$ 107.99 USD
Free Shipping
Add to Wish List
Sale - Save 25%
$ 143.99

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

$ 107.99 USD
Free Shipping
Add to Wish List
Turner E9x Cowl Delete Harness Mounting Bracket mounts to factory bolt holes; it is an easy no-drill install that creates a solid location to tie back your engine harness. However, removing the cowl introduces the possibility of dirt and debris entering your cabin. To solve this issue we suggest pairing it with Burger's Cabin/Cowl Delete Filters. These are small, dry, and maintenance-free filters that both add a finished look to your engine bay and prevent debris from entering the cabin.
Show More Show Less
Turner ECU/ Brake Master Cover Set - E9x
Turner ECU/ Brake Master Cover Set - E9x
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:3136218
Part#: 007629LA10KT
In Stock
Sale - Save 25% $ 182.97

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

$ 137.23 USD
Free Shipping
Add to Wish List
Sale - Save 25%
$ 182.97

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

$ 137.23 USD
Free Shipping
Add to Wish List
Our ECU Cover incorporates beauty with OE function. Designed in-house by our industry leading engineering staff, the E9x Turner ECU Cover incorporates beauty with OE function. Made from a heat resistant, textured matte black polymer material, this cover is sure to be turning heads! This cover gives your engine bay the look it should have came with from the factory and hides away the exposed ECU while helping protect it from the elements. We provide a simple cover that installs directly on top of the ECU bracket for an OEM plus look! Installation is a breeze, simply remove screws from the ECU bracket on either side, line up the ECU cover, and hand tighten the screws back on. Add a flash of style and elegance under your hood with our ECU Cover!
Show More Show Less
Braille Performance Endurance AGM Battery - B10049 - 58lbs
Braille Performance Endurance AGM Battery - B10049 - 58lbs
This item is classified as Hazardous Materials and requires special shipping and handling. We cannot ship this item out of the US or with priority shi
Braille - Corporate Logo
T#:558078
Part#: B10049
Ships in 8 Business Days
$ 446.99 USD
Add to Wish List
$ 446.99 USD
Add to Wish List
This Group 49 Endurance AGM battery is an ideal upgrade from the factory battery, offering higher cranking power and a longer battery life for less waste and lower cost to the customer. Plus, this battery is maintenance free and won't eat holes in the battery tray and surrounding areas of your car. Endurance AGM batteries from Braille are a drop-in OEM replacement that requires no modifications to be made for installation, has the highest cranking power and longest run times in their class, and also feature AGM internal racing technology developed for their Advanced AGM and Carbon Fiber batteries.
Show More Show Less
Braille Lightweight Advanced AGM Battery - B3121 - 21lbs
Braille Lightweight Advanced AGM Battery - B3121 - 21lbs
Braille - Corporate Logo
T#:558042
Part#: B3121
Ships in 6 Business Days
$ 270.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 270.99 USD
Free Shipping on orders $49 and up
Add to Wish List
When building a car for the track, one of the most important factors to consider is weight. Stock batteries can weigh up to almost 50 pounds and are unnecessarily large, designed to power a host of systems not normally used in a track car (radios, lighting, etc.). What can you do to cut weight the weight without affecting your car's operation? This is where Braille Battery comes in with their long line of performance lightweight battery options! Designed to provide the highest cranking power possible while being up to 75% lighter, Braille Battery is one of the foremost leaders in automotive racing batteries with nothing but high quality, high output batteries in mind! The B3121 battery from Braille is their lightest do-everything battery available, offering 1380 pulse cranking amps that can crank over V8 engines with ease while still coming in at under 22 pounds, half of the weight of a standard Group 34 battery! This is thanks to their Advanced AGM racing technology that allows them to put a ton of power into a very small package. Physical Specifications: BCI Group: All sizes Weight: 21lbs / 9.5kg Length: 6.6" / 168mm Width: 5.2" / 132mm Height: 6.8" / 173mm Polarity: Right Side Positive Terminal Type: Steel terminal block with M6 bolt Performance Specifications: Voltage: 12v Recharge Voltage: 14.4V – 14.6V Maintenance charge voltage: 13.8V 5s Pulse Cranking Amps (PCA): 1380 10s PDC: 124 Amp Hour (Ah): 31 Watt Hour (Wh): 372 Life Cycle @ 10% DOD: 3100 Charging Temperature 0C to 50C Discharge Temperature range -40C to +60C Storage temperature -40C to +60C *THIS BATTERY REQUIRES A CUSTOM MOUNTING SOLUTION. The size and weight are significantly smaller than a stock battery and will not be held in place by the stock battery mount*
Show More Show Less
Innovate LC-2 Wideband O2 Controller Kit
Innovate LC-2 Wideband O2 Controller Kit
Innovate Motorsports - Corporate Logo
T#:28836410
Part#: 38770
In Stock at Vendor
$ 212.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 212.99 USD
Free Shipping on orders $49 and up
Add to Wish List

Features & Benefits:

Two configurable linear 0-5V analog outputs Ability to calibrate O2 sensors for maximum accuracy Includes LC-2 controller and Bosch wideband O2 sensor Comes with a program cable, manual, and a 10 ft. sensor cable Includes a 1-inch mild steel exhaust bung Innovate MTS serial in/out capability Integrated dual-color status LED (green/red) Patented DirectDigital™ wideband sensor control Positive lock connectors for all connections Real-time display data on screen or with the powerful LogWorks software Range:

AFR (Air-Fuel Ratio) range from 7.4:1 to 22.4:1 (0.5 to 1.5 lambda)

Show More Show Less
Braille Performance Intensity Carbon Lithium-ION Battery - i48CX - 10.5lbs
Braille Performance Intensity Carbon Lithium-ION Battery - i48CX - 10...
This item is classified as Hazardous Materials and requires special shipping and handling. We cannot ship this item out of the US or with priority shi
Braille - Corporate Logo
T#:558047
Part#: I48CX
Ships in 5 Business Days
$ 1,164.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 1,164.99 USD
Free Shipping on orders $49 and up
Add to Wish List
The ultra-lightweight, standard height I48CX lithium-ION battery from Braille Battery is a popular choice among BMW enthusiasts looking for a drop-in replacement battery that shaves off a ton of weight, 35 pounds in total! Thanks to the Group 48 design of this battery, no modifications are needed for installation. This is perfect for anyone looking to drive their car both on and off of the track, without any negative side effects, and wants a battery with a 10-15 year life span!
Show More Show Less
Endurance Series AGM Battery - B48-H6-L3
Endurance Series AGM Battery - B48-H6-L3
Braille - Corporate Logo
T#:36947237
Part#: B48-H6-L3
Ships in 4 Business Days
$ 398.99 USD
Add to Wish List
$ 398.99 USD
Add to Wish List
Braille Performance GreenLite Lithium-ION Battery - G30 - 5.5lbs
Braille Performance GreenLite Lithium-ION Battery - G30 - 5.5lbs ...
Braille - Corporate Logo
T#:558046
Part#: G30
Ships in 6 Business Days
$ 522.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 522.99 USD
Free Shipping on orders $49 and up
Add to Wish List
The G30 lithium battery from Braille is designed for the Import Tuner market (4 and 6 cylinder) for track use and has enough power for small black V8 race cars and hot rods with light electrical demands/accessories and standard compression. The G30 comes in the popular ETX 30 Group size, just like the B3121 AGM, so it is small and light enough to mount in a variety of locations. Incorporated in this battery is the same technology used in their race winning batteries used by nearly every OEM developer in classes ranging from SCCA to Formula 1.
Show More Show Less

Select Vehicle

BMW Mini
Clear Vehicle

Category

Brand

Price

$
$

Special Offers

Shipping