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Safety Glasses

Safety glasses are an accessory worn to protect the wearer’s eyes against hazards, such as flying particles, toxic compounds and vapors, and harmful gases. Safety glasses can also protect the wearer against light to moderate impacts. They can be used when grinding or cutting metal to protect the wearer’s eyes from metal shavings or particles. Safety glasses are typically made with impact-resistant glass or shatter-proof plastic lenses. 

Category 

Maintenance Tools

Safety Lock Nuts

Safety lock nuts are a type of fastener with a special pattern on their head that requires a unique socket (called a key) to remove and install. Also called anti-theft lug nuts, rim locks, and tire locks, they might be needed if you want to reduce the risk of unauthorized removal and theft of parts. You can find safety lock nuts filling the same holes as standard lug nuts, which are usually used to secure parts like wheels and rims.

System

Drivetrain

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Sampler Blower Motor

The Sampler Blower Motor is a miniature blower for the cabin air temperature sensor of Mercedes vehicles. Cabin air temperature sensors adjust the heating, ventilation, and air conditioning (HVAC) system after reading the cabin temperature. Over time, the miniature blower in the fan can go bad and will need replacing once it starts making loud noises. Together with the temperature sensor, the sampler blower motor is located in the dashboard, next to the ignition lock. 

System

Cooling System

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Sand Blaster Nozzle

A Sand Blaster Nozzle connects to a sand blaster to help direct and spread the contained abrasive material onto a targeted surface. There are different types of blast nozzles on the market, with each designed for different applications. Factors that affect a sand blaster nozzle’s effectiveness and spread include its size, shape, and material. Sand blaster nozzle materials include steel, tungsten carbide, boron carbide, and ceramic. Tungsten carbide nozzles are especially popular due to their durability.

System

DIY

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Sander

The sander is a tool that uses an abrasive pad to smoothen the vehicle’s surface. This tool might be needed for buffing, polishing, and removing unwanted materials like old paint, rust, and varnish. Power sanders work faster than manually sanding the surface of the body panel, saving you time and energy. You might also need a sander for auto detailing work, such as repairing minor scratches.

System

DIY

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Scan Tool

A scan tool is a diagnostic device used to read engine trouble codes. It’s typically plugged into an OBD-I or OBD-II socket to identify and clear codes, as well as view data readouts from sensors.

A standard scan tool can also graph data, display pending codes, and provide troubleshooting procedures to resolve existing issues, depending on the type.

Some scan tools have premium features, including internet access, a built-in multimeter, and more.

System

Tools

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Schrader Valve Tool

The Schrader Valve Tool is a tool used to remove and install the Schrader valve, a common type of tire valve stem found on bicycles and vehicles. Also known as standard valves, Schrader valves are short and sturdy. They have a threaded outer wall for the cap and a bottom wrapped in rubber. You can find all kinds of Schrader valve tools on the market, including versatile double-sided ones that are suited for both long and short valves.

System

Wheels and Tires

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Scraper

A Scraper is a simple hand-held tool with a flat-tipped blade. The typical scraper has a small handle with a blade that’s made from either plastic or metal. As their name implies, scrapers are used to scrape a surface clean of sticky residue, paint, and other things that stick to it. In the automobile industry, there are specially designed scrapers for different jobs. These scrapers have blades of different sizes and shapes to suit the user’s needs.

System

DIY

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Screw Cover

The Screw Cover is a part that covers the screws, protecting them from damage and rust while also improving appearances by hiding the unsightly fasteners. This part might be needed if the existing screw covers have worn out or become too damaged. Screw covers are mounted on the parts that need to conceal their screws, such as the interior door handle.

System

Interior

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Seal Puller

A Seal Puller is a specialized automotive tool that helps remove the seals around transmissions, axles, engine cases, and wheel hubs. The puller’s tip fits behind the seal’s lip and can be maneuvered to pry the seal out. Seal puller designs differ and depend on the type of seal they’re designed to tackle. Some seal pullers come with interchangeable puller tips to accommodate more than one seal type.

System

DIY

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Seat Adjuster Assembly 

A seat adjuster assembly includes mechanisms and controls that let you modify your seat’s position, angle, and other configurations. The exact design and features of seat adjuster assemblies vary depending on the make and model it’s intended for.

It’s important to note that not all vehicles have seat adjuster assemblies. Some older vehicles have manual seat adjuster assemblies, while other models don’t have adjustable seats.

System 

Accessories

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Seat Adjustment Gear

A seat adjustment gear is a component in some vehicles’ automatic seat adjustment mechanism. The seat adjustment gear is one of the gears that allow certain components of an adjusting seat to move. Seat adjustment mechanisms let the driver or passenger adjust their seat position with the touch of a button. In these seats, a motor drives a set of gears that change the seat’s position. An adjusting seat can use several gears to move the seat’s backrest angle, distance to the steering wheel, and seat height.

System

Interior

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Seat Back

The Seat Back is a part of the car seat that supports the driver or passenger’s back. This isn’t to be confused with the backseat, which refers to the seat behind the driver and the front passenger’s seat. The shape and style of seat backs can vary depending on the type of car seat. For example, bucket seats have a rounded seat back that wraps around the driver to prevent them from sliding around.

System

Interior

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Seat Back Organizer

A Seat Back Organizer attaches to the back of either of the front seats and provides storage space for various items. It’s accessible from the back seat and often has different pouches and pockets. The design of these organizers affects what can fit inside. Certain types hold files and folders, water bottles, and smaller items like pens and markers. Some pockets have velcro seals or zippers and can fold up neatly when not in use.

System

Accessories

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Seat Belt

The seat belt is a safety device that protects drivers and passengers from collisions by keeping them in place. This allows the impact to spread across a greater area, minimizing the risk of injuries.

People who use seat belts are also significantly less likely to be flung out of their vehicles in the event of an accident.

System

Seats, Seat Covers & Accessories

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Seat Belt Extender Arm

A seat belt extender arm is a device that makes the seat belt longer.

System

Accessories

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Seat Belt Extension Bracket

The Seat Belt Extension Bracket raises the seat belt buckle to clear obstacles, effectively extending the seat belt without installing a longer belt. This part might be needed if you want the seat belt to clear a console or fit over larger people. Seat belt extension brackets attach to the end of the seatbelt and can mount a seat belt in a location that lacks the safety device. The seat belt uses the seat belt extension bracket to provide better safety for its user.

System

Interior

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Seat Belt Mounting Hardware

When replacing a seat belt, you have to replace its mounting hardware as well. The Seat Belt Mounting Hardware refers to the components necessary to install and secure a new seat belt, such as bolts, nuts, lock washers, and brackets. These pieces of hardware can come in different sizes, but they’re typically made from high-quality solid steel. Different types of seat belts will require different types of hardware, so make sure to check which one your new seat belt needs.

System

Interior

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Seat Belt Pad

A seat belt pad is a cushion that wraps around a portion of the seat belt to soften the belt’s feel against the driver’s or passenger’s body. It prevents the skin from chafing or getting irritated from the seat belt material.

System

Accessories

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Seat Belt Retainer

The Seat Belt Retainer prevents the seat belt buckle from moving past a certain point along the seat belt strap. This keeps the seat buckle in the correct position for easy and hasty buckling up. Certain seat belt retainer types are designed to be used in conjunction with other seat accessories like harnessed car seats for infants. The retainer’s design and installation process can vary depending on the seat belt type.

System

Interior

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Seat Belt Stop

The Seat Belt Stop is a small button typically made of high-quality plastic. It’s positioned along the seat belt, where it prevents the seat belt clip from sliding down to the floor or out of reach. Seat belt stops are usually universal and relatively easy to install. All you have to do is drill a small hole in the seat belt, put the seat belt stopper shaft through the hole, and then fasten it.

System

Interior

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Seat Bracket

The Seat Bracket is a mounting point for car seats. This bracket is usually a fixed frame that prevents the seat from moving forward or backward without a slider.

A common type of seat bracket is a steel or aluminum metal frame that comes with holes to match a vehicle’s mounting scheme.

System

Interior

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Seat Control Unit

The Seat Control Unit regulates the functions of the power seats, including seat adjustment, cooling, and heating. This part might be needed to replace a faulty seat control unit that doesn’t work properly. Often found under the power seat, the seat control unit allows you to adjust the seat to your preference. Power seats rely on their seat control units to turn the user’s inputs into the right commands for the seats’ elements and motors.

System

Interior

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Seat Cover

Seat Covers protect the car seats from stains, spills, crumbs, dust, dirt, and other debris. They also slow down the car seat’s deterioration and let owners customize their ride’s appearance and style.

System

Accessories

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Seat Cushion

A Seat Cushion provides additional padding to a car seat, making the seat more comfortable by distributing the weight of the driver or passenger more evenly. There are a lot of benefits that come with using a seat cushion, from preventing tailbone pain to promoting good posture.

System

Interior

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Seat Flex Cable

The Seat Flex Cable is also known as the seat adjustment cable or seat adjustment flexible shaft. As its name suggests, it’s a shaft that allows the driver or passenger to adjust their seat. This flexible rotary shaft transfers rotational motion that configures the seat according to the driver’s or passenger’s preferences. Seat flex cables can vary in length, but they’re usually easy to install. Some can even be installed without having to cut or splice the cable.

System

Interior

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Seat Foam

A Seat Foam is a form of padding that adds comfort when sitting in your car.

Most seat foams are made from polyurethane foam as the material is highly durable, comfortable, and protective.

There are also some manufacturers that use PUR polyester and PUR polyether, which are both types of plastic.

System

Interior

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Seat Frame

The Seat Frame is the metal framework upon which the driver and passenger seats are built. It serves as the foundation for various seat features, like the cushions, seat adjustment controls, and heating and cooling elements.

Modern seat frames are lightweight and durable with decent reclining ranges. Seat frames vary depending on the type of seat they’re designed to support, the vehicle they’re used for, and the seat augments that fit around them.

System

Interior

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Seat Gapper

A seat gapper is an accessory that fits between the gap between the front driver and passenger seat and the center console. This gap is typically a place where people lose small items like coins and keys. A seat gapper can cover this gap while providing the driver and passenger with additional storage where they can place small or narrow items like phones and change.

System

Accessories

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Seat Heat Pad

A Seat Heat Pad is an accessory that provides warmth and comfort while sitting by generating heat. This makes heated seats ideal for cold weather, long drives, or outdoor events. You can also use them on your office chair.

System

Interior

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Seat Heater Switch

The Seat Heater Switch toggles the seat heater on and off. Like all switches, it is an electrical component that either opens or closes the current, meaning it dictates when its corresponding electronic auto part activates and deactivates.

The seat heater itself is responsible for keeping a car seat warm through heating coils underneath the seat cover. Flipping the switch toggles these coils on or off.

System

Interior

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Seat Hinge Cover

The Seat Hinge Cover is a trim that covers the hinge mechanism between the car seat’s back and bottom. This trim might be needed to conceal the seat hinge from view. The seat hinge cover fits over the seat hinge and protects the hinge from debris or damage. The car seat needs the seat hinge cover to improve its appearance, preserve its ability to adjust its position, and reduce noise.

System

Accessories

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Seat Knob

The Seat Knob is a type of lever that allows drivers and passengers to adjust the position of their car seats. Depending on the vehicle, a seat knob will let you change the height, angle, and lumbar support of your seat. This allows you to customize your seating position in a way that best suits you. Seat adjuster knobs can vary in size and shape, but they’re typically made of high-grade plastic or metal.;

System

Interior

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Seat Latch

The Seat Latch is a switch-operated, metal mechanism that adjusts a vehicle’s seats. It consists of a flat, slightly bent metal plate with raised sides and a locking mechanism on one end. When locked, the latch keeps the seat in place at a fixed angle. Unlocking it allows the seat to move freely. Seat latch designs and sizes vary depending on the vehicle make and model.

System

Interior

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Seat Motor

Typically found in power seats, the Seat Motor helps adjust the position of the car seat, particularly its height. 

System

Interior

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Seat Mount

A Seat Mount is designed to securely attach seats to the vehicle’s frame or floor. It provides a stable and secure base for seats, ensuring safety and comfort. Mounts are usually made from durable materials like steel or aluminum.

System

Interior

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Seat Protector

The Seat Protector is a cover or pad that protects the car seat from damage, dirt, and moisture. This part might be needed if you want to keep the seat clean and unmarred. Placed on top of the car seat, the seat protector reduces the need for cleaning and maintenance. Car seats last longer, stay cleaner, and feel more comfortable with seat protectors.

System

Accessories

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Seat Relay

The Seat Relay is responsible for controlling the power supply to various seat functions, such as heating, seat adjustment, and seatbelt warnings. The seat relay serves as a switch that either opens or closes the circuit, activating or deactivating seat features.

System

Electrical System

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Seat Release Handle

The Seat Release Handle is a component that allows the user to adjust or fold the seats. It lets the user release the seat latch, so the seat folds down or moves forward/backward. The handles are usually on the side or back of the seat, depending on the vehicle.

System

Interior

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Seat Repair Kit

Seat Repair Kits are used to repair different components of car seats. These kits typically contain tools and replacements for damaged tracks, rails, and gears.

System

Interior

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Seat Riser

The Seat Riser is a component of the car seat that allows the driver or passenger to adjust their seat height accordingly. It’s especially helpful for drivers who might be too short and find it difficult to see above the steering wheel. Seat risers are typically made from high-quality steel, and they also come in different finishes. They’re sold separately from the seat riser brackets and have different maximum lifting heights.

System

Interior

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Seat Sensor Pad

The Seat Sensor Pad is a padded section inside vehicle seats with a network of seat occupancy sensors integrated into the design. Seat sensor pads work in tandem with the seat occupancy sensors and the seat belt sensors to determine whether a vehicle occupant isn’t buckled up while in the vehicle. It’s a part of the vehicle’s safety features meant to keep both the driver and passengers safe while driving.

System

Interior

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Seat Slider

The seat slider is the mechanism under your driver or passenger seat that allows you to slide the seat forward or backward. This mechanism is crucial since drivers will need to adjust their seat’s position relative to the pedals depending on their height. 

System

Interior

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Seat Switch

The Seat Switch is usually found on car seats with heating, ventilation, and other similar features. Using the seat switch, the driver or passenger can easily control the power and adjustment features of their seat. This allows them to adjust their seat according to their individual preferences, which helps improve their overall ride comfort. There are different types of seat switches, such as the car seat memory switch, lumbar support switch, and heated car seat switch.

System

Interior

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Seat Trim Cover

Seat Trim Covers are the plastic trim pieces located under the vehicle’s seats. They cover the metal assembly below the seats. The seat trim covers can have holes where the seat controls poke through. This part comes in various shapes and colors to match the vehicle’s seat design.

System

Interior

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Secondary Air Injection Bypass Valve

The secondary air injection system injects fresh air into the vehicle’s exhaust. Doing so burns off excess fuel after a cold start and decreases emissions. The secondary air injection bypass valve is the component that controls airflow into the exhaust system. This valve is typically activated by the vehicle’s computer using connectors.

System

Engine

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Secondary Air Injection Check Valve

The Secondary Air Injection Check Valve regulates the air pumped into the secondary air system, ensuring the air goes one way. This part might be needed to replace a faulty check valve causing issues like increased exhaust emissions. Located between the secondary air pump and exhaust manifold, the secondary air injection check valve helps reduce exhaust emissions. The exhaust system needs the secondary air injection check valve to help keep emission levels under control.

System

Exhaust System

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Secondary Air Injection Hose

The Secondary Air Injection Hose is an important component of the secondary air injection system. When the secondary air injection pump sends fresh air into the exhaust system, it passes through the secondary air injection hose. The hose allows the air to travel to the catalytic converter, where the air helps reduce the vehicle’s emissions. Over time, the secondary air injection hose can turn brittle and crack, causing air to leak through.

System

Engine

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Secondary Air Injection Pipe

The Secondary Air Injection Pipe is a pipe connecting the secondary air injection system to the rest of the engine. It helps supply air to the exhaust system. In a passive system, the air enters the injection pipes due to fluctuations in the exhaust system’s pressure levels. Air is drawn in through the pipes in the system via a timed valve. In an active system, the air flows through the pipe by passing through a pump.

System

Exhaust

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Selector Shaft Seal

The selector shaft seal is a rubber grommet that covers the gap between the transmission selector rod and the transmission case. The selector shaft is responsible for pushing internal transmission components to engage different gears, particularly in an automatic transmission vehicle. Over time, this seal can crack and cause transmission fluid to leak.

System

Transmission

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Semi Circular Plug

The Semi Circular Plug covers a semi-circular recess on the engine, such as the engine valve cover camshaft bore. Sometimes called a half-moon plug, this part might be needed to replace a damaged or worn-out plug. The semi circular plug is often mounted on the cylinder head system, and it prevents oil leaks. The engine relies on the semi circular plug to maintain the integrity of its lubrication system.

System

Engine

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Serpentine Belt

The serpentine belt is the long rubber belt that transfers power to various vehicle parts and electronics such as the alternator, power steering pump, air conditioning, and water pump. Without the serpentine belt, these systems won’t be able to receive the power necessary for them to function. The belt is guided by idler pulleys and tensioners that keep the belt taut. Over time, serpentine belts can become loose and require replacement.

System

Engine

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Serpentine Belt Tool

The serpentine belt tool is a tool for removing and installing serpentine belts in systems with spring-loaded idler pulleys. This tool might be needed if you plan to repair or replace the serpentine belt. Serpentine belt tools can help you access the belt tensioners in hard-to-reach areas. The serpentine belt is easier to work with if you have the serpentine belt tool to facilitate removal and installation.

System

DIY

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Shackle Bolt

The Shackle Bolt is a type of suspension bolt that locks shackle links into place between the leaf spring suspension and the vehicle or trailer. Shackle links connect the vehicle body to the wheels, and they’re held in place by shackle bolts. Shackle bolts come in different sizes, and they’re typically made of high-quality metal with a zinc finish to prevent corrosion. You can get shackle bolts individually or in a set with other parts of the shackle assembly.

System

Suspension

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Shackle Bushing

The Shackle Bushing is the bushing positioned in the leaf spring shackle. It allows movement within the vehicle’s suspension system by protecting the shackle as the shackle moves against the other parts in the system. The shackle connects the leaf springs to the frame of the vehicle, which inevitably leads to a lot of friction as the vehicle moves. The shackle bushing extends the shackle’s life and helps it support the load from the leaf springs.

System

Suspension

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Shift Boot

A Shift Boot covers the gear shifter and protects it from dust, dirt, and debris. It’s usually made from cloth, vinyl, rubber, or leather. Besides functionality, shift boots can also enhance the look of the car interior.

System

Transmission

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Shift Cable Bushing

The Shift Cable Bushing is a flexible tube covering the segment of the shift cable connected to the transmission linkage. This part might be needed as a replacement for old and damaged shift cable bushings that cause issues like the ld

transmission failing to shift gears or engage park mode. Shift cable bushings absorb friction and vibration, reducing wear on the shift cable and shift linkage. The transmission needs shift cable bushings to ensure the shift lever works properly.

System

Transmission

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Shift Cable Repair Kit

The Shift Cable Repair Kit contains the hardware necessary to fix the transmission shift cable without replacing it with a new one. The contents of shift cable repair kits can vary. Some kits contain bushing or clip replacements, while others contain new shift pivot connections. There are also repair kits that let car owners replace the plastic shift cable end joint with a steel one.

System

Transmission

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Speaker

The Speaker is responsible for playing audio inside your vehicle. It allows drivers and passengers alike to listen to the radio, navigation, and other systems that use sound to relay information. 

System

Accessories

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Speed Sensor

The Speed Sensor is a device that measures the wheels or transmission’s rotation speed. The sensor sends this data to the onboard computer to control the speedometer and adjust the transmission shift points. The onboard computer also uses the information from this sensor to manage the anti-lock braking and traction control systems.

System

Transmission

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Speedometer

A Speedometer displays vehicle speed based on the readings generated from the gearbox output shaft.

System

Electrical System

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Sun Visor

The Sun Visor is a flat panel designed to be placed at the front window to protect the vehicle’s cabin from the sun. It protects the driver’s eyes from blinding sunlight and lowers the interior temperature by reflecting direct sunlight.

Prolonged direct contact with UV light can damage the stereo systems, CDs, dashboards, and car seats.

System

Interior

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Sunroof Motor

When activated, the Sunroof Motor moves the cable that pulls the sunroof panel inward or outward. The motor stops operating as soon as the panel reaches the open position.

System

Electrical System

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About The Author
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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