What does OBD mean on a diesel vehicle?

1 Answers
LuciaMarie
07/29/25 11:31pm
OBD on a diesel vehicle stands for "On-Board Diagnostics." OBD is the abbreviation for On-Board-Diagnostics. The main function of this system is to monitor the engine while driving. Once the exhaust emissions exceed the standard (i.e., 1.5 times the emission standard for new vehicles), the malfunction indicator light will be illuminated, and a fault code will be stored. Relevant information about OBD is as follows: 1. The OBD device monitors multiple systems and components, including the engine, catalytic converter, particulate trap, oxygen sensor, emission control system, fuel system, EGR, etc. 2. OBD connects various emission-related component information to the Electronic Control Unit (ECU), which has the capability to detect and analyze faults related to emissions.
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