The automotive repair and purchase of accessories are pretty expensive things. Proper care and maintenance of the vehicle is essential for the durability. Many of the automotive parts and accessories are available online. Once the payment is being done, the items will be delivered at home. The buyer can select the particular brand of parts for his automotive. Knowing the parts and basic knowledge of the working of them will help a lot when it comes to diagnosis and troubleshooting. OBD or On Board Diagnostics is the system in modern cars where the troubleshooting part is handled by the computers. The system generates an error code which is later retrieved by the technician.