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Displaying 151 - 200 of 502 glossary terms Use the search function to find terms.

DSG stands for Direkt-Schalt-Getriebe, also called Direct Shift Gearbox. One can essentially treat it as two manual gearboxes working alternatively but packed inside one housing. Therefore, it… Read more

Dynamic brake control

Dynamic Brake Control is a device that assists in braking in case of an emergency. It is a computer that measures and assists the braking.


E- Brake is a brake that can slow down and hold the vehicle when the hydraulic system fails. It works without having to press the pedal.


E85 is the fuel mixture that contains 85% gasoline and 15% Ethanol.

Easy Entry

Easy Entry is a system that automatically moves the vehicle's power seats backward and retracts the steering column to get easier in and out of the cabin.


ECO means “Eco Mode,” which stands for the economical mode in the car. Its function is to alter certain features of the engine and transmission to minimize fuel consumption.


ECU means Engine Control Unit, which is the brain of the vehicle. It operates the engine and adjusts measured contents, for example, O2 sensors, water, air temperature, and adjusts spark timing.… Read more

Engine Block

Engine Block contains a cast that holds the crankshaft on the lower part. The cylinder bore is honed and on top of the block where the cylinder head will be installed. It is the heaviest part of… Read more


EFI means Electronic Fuel Injection, which injects fuel into the intake manifold to create the air-fuel mixture. It is easier to control compared to carburetors.


EGR, or Exhaust Gas Recirculation, reduces NOx of the exhaust emission by recirculating some of the engine's exhaust back into the intake manifold. Its purpose is to lower combustion… Read more


Electrolyte refers to the mixture of the car battery between water and sulfuric acid.

Emergency Brake

Emergency Brake bypasses the hydraulic brake system on your vehicle, locking the wheels in place. This mechanical system is connected to the emergency brake lever. When engaged in cars with drum… Read more

Emergency Brake Assist

Emergency Brake Assist is an electronic system that maximizes brake efficiency during an emergency stop.

Emergency Trunk Release

Emergency Trunk Release is a handle inside the car which allows you to open the trunk while inside the vehicle. In case of emergency, it can permit to escape through the trunk.

Emission Control System

Emission Control System limits the amount of gas released from the fuel tank, carburetor, crankcase, and exhaust into the environment.

Emissions Standards

Emission Certification Standard is a numerical standard established by the Environmental Protection Agency (EPA), which the vehicle should not exceed.


Engine refers to the gasoline or electrical assembly which moves either burned energy or electrical energy into mechanical energy.

Engine Block

Engine Block refers to a structure containing the cylinders and other parts of an internal combustion engine.. The cylinder block is the main component of the engine that holds other engine parts… Read more

Engine Malfunction

Engine Malfunction can have several causes. Start by reading the fault codes via the diagnostic port under the dashboard or have the vehicle serviced at the dealership.

Engine Oil

Engine oil is used to lubricate and cool the moving parts of the engine. It protects from corrosion and is required to be changed to be maintained regularly. See the owner's manual to check… Read more

Engine Overheating

Engine Overheating occurs if you do not have enough coolant in your cooling system. Turn off the engine as soon as possible and do not continue to drive to avoid more damage. Let the vehicle cool… Read more

Engine Thermostat

Engine Thermostat is installed to the engine block and opens at a specific temperature to engage the whole cooling system. A thermostat is very helpful during the winter months to heat first the… Read more

Entry Lighting

Entry Lighting is an indicator that turns on after the car has been unlocked, or the engine has been turned off. It aids passengers when entering or leaving the vehicle.

Environmental Impact

Environmental Impact is an assessment of the biophysical effects of a vehicle that has on our environment.


Electronic Power Steering ( EPS ) refers to the modern version of hydraulic power steering and is monitored by a warning light that illuminates during an error.


Electronic Stability Control (ESC) refers to a computerized system for improving vehicle stability.

ESC Light

ESC Light illuminates and indicates an error. After starting up the vehicle, the ESC light will turn off. In some vehicles, the light illuminates if traction is lost or the road condition is not… Read more


ESP (Electronic Stability Program) refers to an electronic system designed to assist the driver in maintaining vehicle control during adverse conditions. The ESP automatically applies the brakes… Read more


Ethanol refers to Ethyl alcohol used as a percentage of fuel.


Electric Vehicle (EV) refers to a mode of transport that is powered by electricity. Conventional vehicles use gasoline or diesel engines, but electric cars and trucks use an electric motor powered… Read more

EVAP System

Evaporative Emission (EVAP) control system prevents the escape of fuel vapors from a vehicle's fuel system. A purge valve opens when the engine is running, allowing a vacuum to pull fuel… Read more

Evaporative Control Canister

Evaporative Control Canister refers to a device that captures fuel vapors (hydrocarbons) from a vehicle's fuel tank so that they don't escape into the air.

Exhaust Emissions

Exhaust Emission is the unburned gases emitted when gasoline gets burned.

Exhaust Manifold

An Exhaust Manifold is installed on the cylinder head in which the exhaust valves of the cylinder head let free flow to the downpipe and the catalytic converter.

Exhaust Port

Exhaust Port refers to the way from the exhaust valve to the exhaust manifold.

Exhaust Stroke

Exhaust Stroke refers to the 4th stroke in a four-cycle engine. It is when the piston moves upwards and pushes outburned exhaust gases.

Exhaust System

Exhaust System is everything from the cylinder head to the muffler of the vehicle. It carries exhaust gases, and it damps noises.

Expansion Tank

Expansion Tank is similar to a coolant reservoir, except it has a closed system meaning a cap. Usually, Cooling System with Expansion Tank has no filler cap on the radiator itself.

Extended Warranty

Extended Warranty refers to an additional warranty that can be purchased or added by a car dealership when selling a pre-owned vehicle. It extends the manufacturer's warranty.

External Combustion Engine

External combustion engines burn fuel outside of the engine. Steam engines are external combustion engines.

Fast idle

Fast Idle occurs right after starting up a cold engine which lowers itself shortly after, once the car reaches its drivability.

Fault code

Fault Code gets stored in a control unit to aid the technician in troubleshooting a vehicle problem.


Fender refers to a part that covers the front wheels to prevent mud splattering.


Fiberglass is a composite material that relies upon and small glass fiber for its strength.

Final Drive Ratio

Final Drive Ratio is the ratio measured between the driveshaft and the transmission rate in rpm.


Firewall refers to the metal sheet installed engine compartment and passenger cabin.

Flex Fuel

Flex-Fuel refers to an engine that can run depending on its operation different kinds of fuels or even a mixture of several fuels.


Flooding is to excess fuel filling the cylinders that didn't ignite, which makes the starting of the engine difficult. Gasoline can be pressured down to the oil pan, which will thin the… Read more

Floor Shift

Floor Shift is a lever installed to the floor pan and often enclosed in a plastic console for automatic transmission or a stick shifter that can be a simple as a rubber boot installed over the… Read more


Floorboard refers to the floor under the instrument panel.