A/C Compressor

A pump within the engine which enables the air conditioning to properly function in a vehicle. This device increases the pressure of the refrigerant which allows it to effectively pump cool air into the cabin of a vehicle.

A/C Drain Hose

This hose is used to help remove excess condensation from a vehicle’s air conditioning evaporator which has accumulated during its operation.


Supporting the roof on both sides of a vehicle windshield, this essential component provides added strength to an auto frame.


Short for antilock braking system, this automated braking function is controlled by a vehicle’s internal computer to prevent brakes from locking in slippery conditions and while tires skid after a hard braking has occurred.

Accelerator Pedal Linkage

The components which provide the link from a vehicle’s accelerator pedal and connect it to either a throttle body or a carburetor for older models.

ACE Filter

Also known as the active cornering enhancement filter, the ACE is a critical piece of hardware within electro-hydraulic suspension systems. The ACE adjusts systems to current driving conditions which will aid in the reduction of a vehicle’s rotation in case of a rollover.

Acquisition Fee

This fee is enacted by a leasing company when a lease is first signed. It encompasses a large number of related administrative costs to a lease which include credit report fees, insurance verification costs, the process of accounting for a new lease within a database, and verifying the completion of all related lease documentation. The term is frequently referred to as a bank fee or an administration fee depending on the specific leasing circumstances. These costs may vary depending on the lease provider and terms of an agreement. A reputable leasing agency will provide specific details and cost information for purchasers to fully understand all the associated expenses with a lease agreement. Prospective acquisition fee amounts may be negotiated depending on the exact methods and policies of a leasing company, the leased vehicle, and a buyer’s creditworthiness.

Active Pedestrian Protection System

A built-in vehicle system which warns drivers whenever they encounter pedestrian traffic to help ensure safety for both drivers and pedestrians.

Actual Cash Value

Frequently shortened to “ACV,” the actual cash value of a vehicle is a highly important element of insurance claims. ACV provides the true worth of an insured auto by taking the total vehicle replacement cost and subtracting its current depreciation which is calculated based on vehicle age and its overall condition. Refer to “Replacement Cost” for more information on this process.


Refer to “Actual Cash Value” for more information.

Adaptive Cruise Control

A cruise control system designed to help a vehicle avoid encountering any front-end collisions. Utilizing laser or radar-based detection technology, these systems will automatically slow down or stop a vehicle when they detect an obstacle which may lead to a collision.

Adaptive Headlights

These smart headlights include technology which turns the light fixtures in the same direction as a driver turns the wheel. This turning of the front lighting system provides improved illumination directly in front of a vehicle as it turns to improve overall safety.


Trademarked by the German Association of the Automotive Industry (VDA), this brand name diesel exhaust fluid (DEF) is a high-grade option backed by a large body of industry professionals. By partnering with the VDA, a well-known trade group representing German automotive suppliers and vehicle manufacturers, AdBlue DEF provides drivers with peace of mind in the product’s quality and efficacy.

Adjustable Pedals

Brake and accelerator pedals which can be customized to move either closer or further away from a vehicle’s driver seat to provide added driving comfort to all operators of an automobile.

Adjustable Suspension

Adjustable settings within an adjustable suspension system allow drivers to select various options to improve their driving experience based on the environment or current conditions. Settings provide drivers the means to adjust the damper and often the sprint firmness settings at their discretion.

Administration Fee

Refer to “Acquisition Fee” for more information.

Aerodynamic Drag

The total force exerted by the force of air moving in the opposite direction of a vehicle as it is in motion. Improved efficiency in drag can reduce energy requirements to accelerate a vehicle forward.

Aftermarket Accessory

Any type of vehicle add-on, modification, or other equipment which is bought and installed in a vehicle outside of the listed manufacturer specifications. While these accessories are often equipped at a dealership or another automotive equipment business, they are distinct from other features as they are not included as any part of the original build.

Air Conditioning Refrigerant

This essential component is the liquid which is used within automotive air conditioning units. AC refrigerant is pressurized within vehicular systems to provide cool air into the cabin. It will boil away at ambient room temperature.

Air Conditioning

The process which dehumidifies and cools clean and filtered air to be circulated in an automobile’s cabin during operation.

Air Conditioning Filter

This component removes debris, allergens, and other potential contaminants from an external air source as it enters into a vehicular AC unit’s ventilation system.

Air Filter

All incoming air which flows to a vehicle’s under-the-hood areas is filtered from various contaminants using this component.

Air Filter Restriction Indicator

An indication within a vehicle’s systems which identifies that the air filtration system is blocked or malfunctioning and may require service to correct.

Air Filtration

The process of removing a variety of impurities and particulates from the air filtering into a vehicle’s cabin. Air is purified using a filter placed within a vehicle’s ventilation system. Properly functioning filters eliminate pollen, mold, dust, and other contaminants.

Air Pollution Score

This score is provided by the EPA to give new vehicles a measurement on the total amount of potential air pollutants which are produced during their operation. Scores can range from zero to ten based on factors including the emission of greenhouse gases. A higher score indicates a better environmental footprint with fewer detected pollutants produced by the vehicle.

Air Pump Filter

This filter works to keep the air injection system clean and free from contaminants by filtering out and removing particulates from the air supply which feeds it and allows it to operate.

Airbag Deactivation

This system utilizes a weight detection system to determine whether or not to activate the front passenger airbag on a vehicle. When an individual at a minimum weight threshold sits in the front passenger seat, the respective airbags are enabled. When no one is detected in the seat, these airbags are deactivated. This system helps to prevent unnecessary airbag deployment in a collision or other accident.


A cushion which fills with air and deploys when a major impact, collision, or other accident occurs. Airbags are essential safety components which reduce the chance of a vehicle occupant from impacting the dash or other interior surface. They also provide a safe cushion to reduce the overall force of impact in the event of an accident.

Angle of Approach

Referring to a vehicle moving between a level road and a steeper roadway, the angle of approach denotes the steepest angle which an automobile can move between both surfaces without any type of contact between the front end and the roadway itself. Understanding this component can prevent a vehicle’s front end from colliding with the surface of the road and causing damage.

Angle of Departure

Similar to the “Angle of Approach,” this denotes the steepest possible incline a vehicle can drive between a high angled road and a level one without causing an impact between the surface of the road and the rear end of an automobile. Traveling between extremely steep roadways and level surfaces could damage a vehicle if this angle is not properly determined prior to driving.

Antenna Type

The specific type of antenna which a vehicle’s audio or navigational system uses to operate. Common antenna types include power telescoping, mast, diversity, and element. Some vehicles may be equipped with multiple antenna types depending on their specific usage.

Antilock Brake System High Pressure Hose

The high pressure hose within an ABS fixture provides the means to transport hydraulic fluid into the braking system itself. To accommodate the high pressure of the hydraulic motion, these hoses are typically equipped with high endurance metal fittings at both ends for added strength and stability.


A system or other device which is installed and utilized to prevent any unauthorized access or usage of an automobile. These systems help to reduce the chance of a vehicle being stolen through a variety of methods.

Anti-Theft Alarm

A device which typically deploys an audio siren or other notification to alert a vehicle owner of unauthorized access or attempted theft. In some cases, these systems may also alert law enforcement of the unauthorized access.

Anti-Theft Codes

To help prevent theft in an audio system, a key code can be used to lock out functionality on these units. A four, five, or six digit key can be set up which must be entered to restore a vehicle’s audio head unit after it has been disconnected and then reconnected from the battery.

Anti-Theft Immobilizer

This electronic device is used to help prevent an engine from being started in the event of a vehicle theft or unauthorized use. Typically built into a key housing, a small transmitter must be present when the key is inserted in the ignition to allow a vehicle to start up and operate.

Anti-Theft Remote Control

Typical in most modern vehicles, these remotes are used to lock or unlock doors, open the trunk or hatch, roll down windows, or even open/close the sunroof. Remotes can be built into a key housing or be distinct from a vehicle key depending on an automobile’s specific features.


Refer to “Coolant” for more information.


Otherwise known as the Annual Percentage Rate, this figure is the total cost of credit (i.e. an interest rate) for a vehicle loan or lease which is denoted as the yearly interest percentage.

Asking Price

When buying a car from a dealer or private seller, this is the initial price which is set and advertized prior to any negotiations, discounts, or related pricing changes.

Assignment Fee

Refer to “Acquisition Fee” for more information.


Abbreviation for advanced technology-partial zero emission vehicle. This standard refers to a vehicle which meets all the primary requirements for a partial zero emission vehicle alongside further innovations which make it even more efficient in its overall operation. Examples of advanced technology include natural gas-based vehicles as well as hybrid vehicle batteries which reduce traditional engine emissions.


A Honda-specific innovation, the Automatic Torque Transfer System is designed to equally distribute an engine torque across all the driven axles. This system helps to produce the most consistent torque output which yields the most effective results in all areas of a vehicle. Honda has distinguished itself with the utilization of this type of system in many of their makes and models.

ATTS Unit Fluid

This is the hydraulic fluid which is specifically used in all of the Honda Automatic Torque Transfer Systems (ATTS). Refer to “ATTS” for more information.

Audio Format

The specific format of a digital audio file using whichever compression technology that allows readability and playability within a vehicle’s audio system. Common audio formats include MP3, WMA, WAV, AAC, and SACD, and play compatibility will vary based on specific vehicles.

Audio Remote Control

Typically a handheld device, this wireless technology utilizes either infrared or radio waves to activate and control a vehicle’s sound system. Remote controls are normally used to turn audio systems on or off, adjust the volume, and change related output settings.

Auto-Delay Headlights

A feature which leaves headlights illuminated after a driver has parked and turned off a vehicle. This delay ensures that occupants will have adequate lighting from the front end of the automobile as they exit a vehicle. Depending on the vehicle, the delay can range from 30 seconds to several minutes or more before headlights are automatically switched off.

Auto Dimming Rearview Mirror

Refer to “Electrochromatic Rearview Mirror” for more information.

Auto-Leveling Suspension

A suspension system which is designed to specifically adjust the height of a vehicle to ensure that its rear remains even with the front whenever it contains cargo. A suspension leveling system prevents transportation complications due to an uneven weight load within a vehicle. Many of these suspension systems offer even more settings which provide ease and convenience during transport. These include settings for off-road, high speed, and other uses.