There are 62 car parts that start with the letter D. From Dackboards to Dynamometer. Car parts refer to the various components that make up a vehicle, each playing a crucial role in its overall operation and performance. These parts can range from essential functional components like engines and transmissions, to auxiliary parts such as belts and hoses. The proper maintenance and timely replacement of car parts are vital for ensuring vehicle safety, efficiency, and longevity. With advancements in technology, many car parts now include electronic components, enhancing their functionality and enabling features such as automated driving systems and improved infotainment options.

An interesting fact about car parts is that many vehicles contain around 30,000 different parts, and the automotive industry is continuously evolving with new materials and technologies. For instance, lightweight composites are increasingly being used to improve fuel efficiency, while high-strength steel remains a staple for structural components due to its durability.

Here’s what each of the columns in the table means:

Function: A brief description of what the car part does within the vehicle system.

Maintenance Interval (months): The recommended time period after which the part should be inspected or replaced, measured in months.

Replacement Cost (USD): An estimate of the average monetary cost incurred when replacing the part, expressed in U.S. dollars.

Description: A detailed explanation of the car part, including its significance, materials, and placement in the car’s architecture.

Car parts That Start With D

Car parts function maintenance interval (months) replacement cost (USD)
Dackboards Protects the underside of the vehicle from damage and wear 12 35
Damper Helps absorb and control the movement of the suspension system, providing a smooth ride. 12-24 100-500
Damper Ring Provides friction damping for the steering wheel to prevent excessive oscillations. 12 20
Damper Strap Desiccant Cartridge Differential Fluid Cooler Differential Lock
Dash Cluster Displays vehicle speed, engine RPM, fuel level, and other important information for the driver 12 100-300
Dash Trim Decorative elements that surround the dashboard and instrument cluster 24 50-200
Dashboard Displays important information and controls for the driver, such as speedometer, odometer, fuel gauge, and various warning lights. N/A 200-1000
Dashpot Provides damping to smooth out throttle response and prevent abrupt changes in engine speed. 24 30
Data Link Connector Provides a standardized interface for diagnostic equipment to communicate with a vehicle’s onboard computer systems. N/A N/A
Daytime Running Lights Provides additional visibility for the vehicle during daylight hours 24 75
Daytime Running Lights (DRLs) Automatically turns on the vehicle’s exterior lights to increase visibility during the day 12 25-75
Debooster Converts high-pressure brake fluid to a lower pressure for the brake system 36 120
Deck Lid Provides access to the trunk or cargo area of the vehicle 60 250
Deck Lid Actuator Provides power to open and close the trunk or hatch of a vehicle. 60 100
Decklid Hinge Allows the decklid (trunk lid or tailgate) to open and close smoothly. 24-48 50-200
Decklid Release Allows the driver to open the trunk or hatchback from the interior of the vehicle 24 15-40
Deflector Plate Redirects airflow around the vehicle to improve aerodynamics and fuel efficiency 24 65
Defroster Duct Directs warm air from the heater core to the windshield and side windows to remove frost and fog. N/A 20
Defroster Hose Delivers warm air from the vehicle’s heating system to the windshield and side windows to clear fog and ice 24 10-25
Defroster Vents Directs warm air from the defroster duct to the windshield and side windows. N/A 10
Degreasers Cleans and removes built-up grease and oil from engine components 6 20
Deicing System Prevents the formation of ice on critical vehicle components 12 150
Desiccant Absorbs and removes moisture from the air in the vehicle’s air conditioning system 12 35
Desiccant Bag Absorbs moisture in the air conditioning system to prevent corrosion and component damage. 24 5
Detent Spring Provides a ‘click’ feeling when engaging a gear or setting a control in a specific position 36 5-15
Diagnostic Connector Provides access to the vehicle’s onboard computer system for diagnostics and programming. N/A 50-200
Diaphragm Vacuum Booster Enhances the brake pedal force to provide power-assisted braking 60 100-300
Differential Allows for different wheel speeds during turns, providing power to the wheels 24 500
Differential Carrier Houses the differential gears and allows the driven wheels to rotate at different speeds while turning 60 150-500
Differential Carrier Bearing Supports the differential housing and allows it to rotate smoothly 24 100-300
Differential Cover Protects the differential gears and housing from environmental contamination. 12 50
Differential Drain Plug Allows for the easy draining and refilling of differential fluid 12 5-20
Differential Fluid Lubricates the differential gears and helps transfer power from the driveshaft to the wheels. 12-24 20-100
Differential Fluid Level Sensor Monitors the fluid level in the differential to ensure proper lubrication. 12 30
Differential Mounts Provide a secure attachment point for the differential housing to the vehicle’s frame or subframe. 24 100
Differential Pinion Bearing Supports the pinion gear shaft in the differential assembly 24 50-200
Differential Seal Prevents leakage of differential fluid from the differential housing 24 20-100
Dipstick Measures the level of engine oil in the crankcase 6 10
Dipstick Tube Guides the dipstick into the engine oil pan for accurate oil level measurement. N/A 10
Disc Brake Caliper Applies pressure to the brake pads, causing them to grip the brake disc and slow the vehicle. 12 100
Disc Brake Pads Provide friction to slow and stop the vehicle 12 50
Disc Brake Rotor The rotating component that the brake pads grip to slow or stop the vehicle. 12 100
Disc Brakes Convert the vehicle’s kinetic energy into heat to slow and stop the vehicle 24 300
Distributor Directs the flow of electricity from the ignition system to the spark plugs 36 150
Distributor Cap Distributes high-voltage electrical current from the ignition coil to the spark plugs. 12-24 20-100
Distributor Gear Transfers the rotational motion from the camshaft to the distributor shaft. 24 30
Distributor Rotor Rotates within the distributor to direct the high-voltage spark to the appropriate spark plug. 12-24 10-50
Distributor Shaft Rotates to deliver the high-voltage spark to the correct spark plug at the right time. 24 50
Dome Light Illuminates the interior of the vehicle, typically activated by the door opening or a switch 24 10-50
Door Actuator Provides power to open and close the vehicle’s doors electronically 36 100-300
Drain Plug Allows for the removal of fluids, such as engine oil or transmission fluid, during service and maintenance. N/A 5-20
Drive Shaft Carrier Bearing Supports and guides the driveshaft, reducing vibration and allowing smooth power transfer. 24-48 100-300
Drive Shaft U-Joint Allows the driveshaft to flex and rotate, transferring power from the transmission to the differential. 24-48 50-200
Driveline Transmits power from the transmission to the wheels 48 800
Driven Pulley Receives power from the engine via the drive belt and transfers it to the driven components. 24-48 50-200
Driveshaft Transfers rotational power from the transmission to the differential 36 300
Drooping Leaf Springs Provide suspension and support for the vehicle’s weight 60 150
Drum Brake Shoes Provide friction to slow and stop the vehicle when the brakes are applied. 12-48 50-200
Drum Brakes Use brake shoes that expand outward to press against the inner surface of a drum 24 150
Dust Boots Protect the constant-velocity (CV) joint from dirt, debris, and moisture 12 40
Dust Seals Prevent the entry of dirt, dust, and other contaminants into vehicle components 12 25
Dynamometer Measures the power output and performance of a vehicle’s engine 12 5000

Descriptions

Dackboards
Dackboards, also known as under-body panels, are protective components installed on the underside of a vehicle to shield it from road debris, rocks, and other environmental hazards that could cause damage or accelerate wear.
Damper
A shock absorber that dampens the vertical motion of the vehicle’s wheels, reducing bouncing and improving handling.
Damper Ring
A damper ring is a small rubber or elastomeric component that is installed in the steering system to help control the amount of vibration and feedback transmitted to the steering wheel.
Damper Strap
Differential Oil Pump
Dash Cluster
The dashboard cluster is the main instrument panel that provides the driver with essential vehicle information at a glance.
Dash Trim
Dash trim pieces add style and finish to the dashboard area, protecting it from wear and tear.
Dashboard
The central control panel in a vehicle, providing the driver with essential information and controls for safe and efficient operation.
Dashpot
A dashpot is a type of damping device that uses the resistance of a fluid, typically oil, to slow down the motion of a mechanism, such as the throttle linkage in an automobile engine.
Data Link Connector
The data link connector, also known as the OBD-II port, is a standardized diagnostic interface that allows mechanics and technicians to access and read diagnostic trouble codes from a vehicle’s onboard computers.
Daytime Running Lights
Daytime Running Lights (DRLs) are forward-facing lights on a vehicle that automatically illuminate when the engine is running, enhancing the vehicle’s visibility and improving road safety, especially in low-light conditions.
Daytime Running Lights (DRLs)
DRLs are energy-efficient exterior lights that come on when the engine starts, enhancing the vehicle’s visibility and safety for other drivers on the road.
Debooster
The Debooster is a component in the brake system that reduces the pressure of the brake fluid, providing the appropriate amount of force to the wheel brakes for effective and controlled braking.
Deck Lid
The Deck Lid, also known as the trunk lid or hatchback, is the hinged panel that covers the rear storage area of a vehicle, allowing access to the trunk or cargo space.
Deck Lid Actuator
The deck lid actuator is an electromechanical device that is responsible for the automatic opening and closing of the trunk or rear hatch in a vehicle, typically powered by the vehicle’s electrical system.
Decklid Hinge
The hinged mechanism that connects the decklid to the vehicle’s body, enabling the easy opening and closing of the trunk or tailgate.
Decklid Release
The decklid release mechanism is typically a button or lever located inside the cabin that, when activated, unlocks and pops open the trunk or hatchback.
Deflector Plate
The Deflector Plate is an aerodynamic component installed on the underside of a vehicle, typically near the front, that helps to smooth and guide the flow of air around the vehicle, reducing drag and improving fuel economy.
Defroster Duct
The defroster duct is a component of the vehicle’s heating and ventilation system that channels warm air from the heater core to the vents on the windshield and side windows to help defrost and defog the glass.
Defroster Hose
Defroster hoses are flexible conduits that channel heated air from the vehicle’s HVAC system to the vents aimed at the windshield and side windows.
Defroster Vents
Defroster vents are the openings in the dashboard or instrument panel that allow the warm air from the defroster duct to flow onto the windshield and side windows, helping to clear fog and frost.
Degreasers
Degreasers are specialized cleaning agents used to dissolve and remove accumulated grease, oil, and other contaminants from the engine and other vehicle components, preparing them for maintenance or repair.
Deicing System
The Deicing System, often found on aircraft but also used in some high-end vehicles, is a technology that uses heat or chemical agents to prevent the buildup of ice on surfaces such as the windshield, mirrors, and exposed sensors, ensuring proper function in cold weather.
Desiccant
The Desiccant is a component in the vehicle’s air conditioning system that helps to remove any residual moisture, preventing the formation of ice and maintaining the efficiency of the cooling system.
Desiccant Bag
A desiccant bag is a small, sealed pouch containing a desiccant material, such as silica gel, that is installed in the air conditioning system to remove excess moisture and prevent the buildup of condensation.
Detent Spring
Detent springs are small, curved metal components that create a tactile feedback when manipulating gear shifters, turn signal stalks, and other vehicle controls.
Diagnostic Connector
A standardized interface that allows mechanics and technicians to connect diagnostic tools to the vehicle’s electronic systems, enabling them to read and clear trouble codes.
Diaphragm Vacuum Booster
The diaphragm vacuum booster uses engine vacuum to multiply the driver’s brake pedal input, making it easier to apply the brakes.
Differential
The Differential is a critical component in the vehicle’s drivetrain that distributes power from the transmission to the wheels, allowing them to rotate at different speeds when the vehicle is turning, improving traction and handling.
Differential Carrier
The differential carrier is the main housing that contains the differential assembly, which is critical for smooth, controlled turning of the vehicle.
Differential Carrier Bearing
The differential carrier bearing is a crucial component that enables the differential to function properly and transmit power to the wheels.
Differential Cover
The differential cover is a protective housing that encloses the differential assembly, including the gears and bearings, to keep out dirt, debris, and other contaminants that could damage the differential components.
Differential Drain Plug
The differential drain plug provides access to the differential housing, making it easy to perform routine fluid changes and maintenance.
Differential Fluid
A specialized lubricant designed to reduce wear and friction in the differential assembly, ensuring smooth and efficient power transfer to the vehicle’s wheels.
Differential Fluid Level Sensor
The differential fluid level sensor is a device that measures the amount of lubricating fluid in the differential, and sends a signal to the vehicle’s computer to indicate if the fluid level is low and needs to be topped up.
Differential Mounts
Differential mounts are the rubber or metal bushings that connect the differential assembly to the vehicle’s chassis, helping to isolate vibrations and provide a cushioned attachment point for the differential.
Differential Pinion Bearing
The differential pinion bearing ensures smooth and efficient power transfer from the driveshaft to the differential and ultimately to the wheels.
Differential Seal
The differential seal is a critical component that helps maintain the proper lubricant level and prevent contamination in the differential.
Dipstick
The Dipstick is a long, thin rod that is inserted into the engine oil reservoir to check the level and condition of the engine oil, allowing the driver to ensure proper lubrication of the engine components.
Dipstick Tube
The dipstick tube is the hollow, cylindrical component that houses the engine oil dipstick and provides a path for it to be inserted into the oil pan, allowing the driver to check the engine oil level.
Disc Brake Caliper
The disc brake caliper is the assembly that houses the brake pads and applies clamping force to the brake disc, converting the vehicle’s kinetic energy into heat to slow or stop the wheels.
Disc Brake Pads
Disc Brake Pads are the replaceable components in a disc brake system that press against the rotor to create the friction necessary to slow and stop the vehicle, and must be regularly inspected and replaced as they wear down.
Disc Brake Rotor
The disc brake rotor, also known as the brake disc, is the circular, metal component that rotates with the wheel and is gripped by the brake pads to provide the friction necessary to slow or stop the vehicle.
Disc Brakes
Disc Brakes are a type of brake system that uses calipers to press brake pads against a disc or rotor attached to the wheel, converting the vehicle’s momentum into heat to slow and stop the vehicle effectively and with consistent performance.
Distributor
The Distributor is a critical component in the vehicle’s ignition system that routes the high-voltage electrical current from the ignition coil to the appropriate spark plug at the correct timing to ignite the air-fuel mixture in the engine cylinder.
Distributor Cap
A component in the ignition system that routes the high-voltage spark from the ignition coil to the correct spark plug, ensuring proper ignition timing.
Distributor Gear
The distributor gear is a small, toothed gear that is driven by the camshaft and in turn drives the rotation of the distributor shaft, which is responsible for timing the ignition sparks to the correct cylinders.
Distributor Rotor
The rotating component in the distributor that points the high-voltage current to the correct spark plug, ensuring proper ignition timing and engine operation.
Distributor Shaft
The distributor shaft is the central component of the distributor that rotates in sync with the engine’s crankshaft, using a series of gears to time the delivery of the ignition spark to each cylinder.
Dome Light
The dome light provides general illumination in the cabin, making it easier for occupants to see inside the vehicle at night or in low-light conditions.
Door Actuator
The door actuator is a motor-driven mechanism that allows the doors to be opened and closed remotely or automatically, often integrated with the vehicle’s central locking system.
Drain Plug
A threaded plug located at the bottom of the oil pan or transmission case that can be removed to drain the fluid during routine service or repair.
Drive Shaft Carrier Bearing
A bearing that is mounted on the driveshaft and helps to support and guide the shaft, reducing vibration and ensuring efficient power transmission from the transmission to the rear or all-wheel drive components.
Drive Shaft U-Joint
A universal joint that connects the driveshaft to the differential, enabling the driveshaft to flex and rotate as needed to accommodate the relative movement between the transmission and differential, ensuring smooth power delivery.
Driveline
The Driveline, also known as the drivetrain, is the system of components that transfers the power generated by the engine to the wheels, enabling the vehicle to move, and includes the transmission, differential, and axles.
Driven Pulley
A pulley that is connected to and driven by the engine’s main drive belt, transmitting power to other vehicle systems, such as the alternator, water pump, or air conditioning compressor.
Driveshaft
The Driveshaft is a long, tubular component that connects the transmission to the differential, transmitting the rotational force from the engine to the wheels, allowing the vehicle to move forward or backward.
Drooping Leaf Springs
Drooping Leaf Springs are a type of suspension component that use a series of curved, overlapping steel leaves to support the vehicle’s weight and absorb shocks from the road, offering a smoother ride and improved stability.
Drum Brake Shoes
The components within a drum brake system that press against the inside of the drum to create the friction necessary to slow and stop the vehicle.
Drum Brakes
Drum Brakes are a type of brake system that uses a circular drum attached to the wheel, with brake shoes that expand outward to press against the inner surface of the drum, creating the friction necessary to slow and stop the vehicle.
Dust Boots
Dust Boots, also known as CV joint boots, are flexible, accordion-like covers that protect the constant-velocity (CV) joints in the vehicle’s driveline from the intrusion of dirt, debris, and moisture, which can cause premature wear and failure.
Dust Seals
Dust Seals are small, specialized gaskets or covers installed around the openings of various vehicle components, such as wheel bearings, CV joints, and steering linkages, to keep out dirt, dust, and other environmental contaminants that could cause damage or accelerate wear.
Dynamometer
A Dynamometer, or ‘dyno’ for short, is a specialized piece of equipment used to measure the power output and performance characteristics of a vehicle’s engine, allowing technicians to diagnose issues, tune the engine, and verify the vehicle’s capabilities.

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