O

OEM

Shorthand for “Original Equipment Manufacturer,” the original manufacturer of a vehicle or other related automotive equipment.

Office of Defects Investigation

Office within the National Highway Traffic Safety Administration primarily responsible for investigating potential defects and safety hazards on vehicles and related equipment. The office conducts comprehensive evaluations of vehicles to identify defects in workmanship, construction, design, operation, and additional factors. When defects are identified, the office also administers a safety recall with the vital information owners and lessees should know about repairs. They also continually monitor manufacturer efforts to ensure they are effectively addressing the safety recall and providing the proper methods to correct them.

Off-Road Ready

A vehicle which is equipped for use in off-road environments. These vehicles are typically higher off the ground to accommodate the varied terrain. They also feature equipment, construction, and design elements to for successful and safe travel in off-road conditions.

Oil Filter

A canister within an engine’s lubrication system with a cartridge used to filter out contaminants, pollutants, and other components from the engine operation. Small bits of matter and dirt can create an abrasive effect within an engine as they accumulate – reducing efficiency and potentially damaging it. Regularly changed oil filters help prevent these problems for more efficient engine functionality.

On-Board Diagnosis System

Computer-based system equipped in vehicles used to identify problems, malfunctions, and other issues throughout a vehicle’s many different systems and devices. Typically these diagnostic systems supply a numerical trouble code readout which refers to a specific problem area which must be addressed. Specialized equipment can obtain a readout from the vehicle for an accurate identification of where a problem may be occurring. Drivers will often see a “Check Engine” or “Service Engine Soon” light appear as an indicator that a problem has been detected within the vehicle.

One Hundred Fifteen Volt Alternating Current Outlet

More commonly referred to as the “115V AC Outlet,” this vehicle-equipped electronic socket supplies a 115V AC power source for providing electricity to devices plugged into it. The electricity source is produced through the vehicle’s own charging system.

One-Touch Windows

Vehicle windows that include a changeover switch to automatically roll them all the way up or down with only one touch of the window button. While they can be quickly brought all the way or down, occupants can also manually interrupt the motion and move the window to any position they desire. This allows for full window control with the convenience of one-touch functionality as well.

Optional Equipment

Vehicular equipment that is not included in the manufacturer’s initial base listing of features and amenities. Optional equipment is listed on the Window Sticker with associated prices of each additional feature available.

Overpressure Safety Switch

A switch equipped within a turbocharged engine which offers a warning to the operator when intake pressure levels have reached overly excessive or dangerous levels. Equipment malfunction can cause this pressure to spike to potentially harmful levels. This switch prevents the pressure from exceeding these thresholds and warns the driver of the problem.

Oversteer

Within vehicle handling dynamics, an issue which causes a car to turn and steer more than the amount the driver had intended due to the rear wheels sliding too far to the outside of the turning direction. This misalignment of actual handling and driver intent can cause potentially dangerous circumstances during vehicle operation.

Oxygen Sensor

Sensor built into a computer-enabled vehicle with a fuel injection system used to monitor current oxygen and fuel levels within the exhaust. This air and fuel ratio is used by the vehicle’s fuel control system to adjust the level of fuel entering into the engine to improve overall engine efficiency and continually remain at ideal operating levels.