What is an OBD device?

1 Answers
DeJude
07/29/25 9:10am
OBD refers to the On-Board Diagnostics system. OBD is the abbreviation of On-Board-Diagnostics, which is translated as "On-Board Diagnostics System" in Chinese. This system continuously monitors whether the vehicle's emissions exceed the standard based on the engine's operating conditions. Once the emissions exceed the standard, it will immediately issue a warning. Here is more information about the OBD system: 1. How the OBD system works: OBD connects various emission-related component information to the Electronic Control Unit (ECU), which has the function of detecting and analyzing emission-related faults. When an emission fault occurs, the ECU records the fault information and related codes, and issues a warning through the fault light to inform the driver. The ECU ensures access and processing of fault information through a standard data interface. 2. Advantages of the OBD system: The useful information obtained after system self-diagnosis can assist in vehicle maintenance and repair. Maintenance personnel can use the vehicle's original factory-specific instrument to read fault codes, thereby quickly locating faults to facilitate vehicle repair and reduce the time for manual diagnosis.
Was this review help?
18
3
Share
More Forum Discussions

How to Remove the Octavia Radiator?

Octavia radiator removal steps are as follows: 1. Open the car's hood, remove the intake pipe located above the radiator fan, and then remove the radiator fan. 2. The radiator fan and air conditioning fan are mounted on the fan frame, with four corners, each secured by a screw. 3. Use professional tools to unscrew these four screws. 4. Once all screws are removed, the radiator fan can be taken off the vehicle. Steps for adding water to the car radiator: 1. Turn the pressure cap counterclockwise. 2. Fill the coolant expansion tank with an appropriate amount of coolant, ensuring the level is between the MAX and MIN marks on the tank.
3
1
Share

What is the solution for low-speed jerking in Audi Q5?

Audi Q5 low-speed jerking solutions are as follows: 1. Eliminate normal jerking causes; check if the transmission temperature is normal. 2. If abnormal, inspect the transmission cooling system; reprogram the transmission computer system; replace transmission fluid; check for damage to internal valve bodies in the transmission. Below is relevant information: 1. Upshift jerking: Upshift jerking is mostly caused by insufficient response speed of the transmission, where the upshift speed cannot keep up with the throttle input, resulting in a jerking sensation during gear changes. 2. Downshift jerking: Downshift jerking is primarily due to the intervention of the energy recovery system. When the driver releases the accelerator pedal or presses the brake pedal, the generator immediately starts working, imposing some load on the engine and affecting its speed.
2
0
Share

How to solve the problem of the Envision's engine yellow light on and power loss?

Envision's engine power loss is most likely due to a faulty oil solenoid valve, which requires replacement. Below is relevant information: 1. Body dimensions: The Envision is a mid-size SUV under the Buick brand, with competitors like the Toyota Highlander in the same class. The Buick Envision is a very popular model in China. The 2019 Buick Envision has body dimensions of 4667/1839/1660mm and a wheelbase of 2750mm. 2. Powertrain: The Envision is equipped with a 1.5T turbocharged engine with a maximum power of 124kW, paired with a 7-speed wet dual-clutch transmission. It also features a 2.0T turbocharged engine with a maximum power of 191kW, matched with a 9-speed automatic transmission, both standard with an all-wheel-drive system.
17
4
Share

What is the Emission Standard for the 2018 Buick GL6?

2018 Buick GL6 meets the China V emission standard. Here are the methods to check a vehicle's emission standard: 1. Check the vehicle's environmental protection label: The label clearly indicates the standard at the back. 2. Visit the public inquiry platform of the Motor Vehicle Environmental Protection Website: Enter the vehicle's VIN (Vehicle Identification Number) and the last 6 digits of the engine number to check the vehicle information. 3. Determine based on the vehicle's manufacturing year: Most vehicles after 2008 are China IV; vehicles registered in 2007 could be China III or China IV; vehicles before 2007 are mostly below China IV, meaning China III or China II; vehicles before 2005 are mostly China II. 4. Bring the vehicle registration certificate (original or copy) to the local DMV for inquiry.
14
3
Share

Is the dfma15t engine domestically produced or joint-venture?

dfma15t engine is a domestically produced engine, independently developed and manufactured by Dongfeng as a gasoline engine. The Dongfeng Aeolus Yixuan 230T is equipped with a 1.5T turbocharged engine, which is the DFMA15T engine, delivering a maximum power of 110kW, a maximum torque of 230Nm, and a maximum horsepower of 150. For daily maintenance of the dfma15t engine, the following methods can be used: Use lubricating oil of the appropriate quality grade. For gasoline engines, select SD--SF grade gasoline engine oil based on the additional devices of the intake and exhaust systems and usage conditions. For diesel engines, choose CB--CD grade diesel engine oil according to mechanical load, with the selection standard not lower than the manufacturer's requirements. Regularly change the oil and oil filter. The quality of any grade of lubricating oil will change during use. After a certain mileage, performance deteriorates, leading to various engine problems. To avoid malfunctions, change the oil regularly according to usage conditions and maintain an appropriate oil level. When oil passes through the fine pores of the filter, solid particles and viscous substances in the oil accumulate in the filter. If the filter becomes clogged and oil cannot pass through, it may rupture the filter or open the safety valve, allowing oil to bypass through the bypass valve and carry contaminants back to the lubrication areas, accelerating engine wear and increasing internal contamination. Regularly clean the crankcase. During engine operation, high-pressure unburned gases, acids, moisture, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls, mixing with metal particles from component wear to form sludge. A small amount remains suspended in the oil, while a large amount precipitates, clogging filters and oil passages, making engine lubrication difficult and causing wear. Regularly use a radiator cleaner to clean the radiator. Removing rust and scale not only ensures the engine operates normally but also extends the overall lifespan of the radiator and engine.
19
5
Share

Is BMW xDrive a Full-Time Four-Wheel Drive System?

BMW xDrive is not a full-time four-wheel drive system; it is an on-demand four-wheel drive system. The xDrive system can be found in many BMW sedans and SUV models. There are three types of four-wheel drive systems: full-time four-wheel drive, part-time four-wheel drive, and on-demand four-wheel drive. Below is an introduction to four-wheel drive systems: 1. Vehicles equipped with an on-demand four-wheel drive system do not have power delivered to all four wheels at all times. Most of the time, these vehicles operate in two-wheel drive mode and only switch to four-wheel drive when encountering specific road conditions. 2. The switching between four-wheel drive and two-wheel drive in an on-demand four-wheel drive system is automatically managed by the computer, requiring no input from the driver. A full-time four-wheel drive system can enhance the mechanical grip of the wheels, thereby improving the vehicle's driving stability.
2
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.