What are the reasons for the OBD warning light in diesel vehicles?

[VonMariana]

Diesel vehicle OBD light indicates excessive exhaust emissions or engine malfunction. Here is the relevant information about the OBD light in diesel vehicles: 1. Meaning: OBD stands for On-Board Diagnostics, an onboard automatic diagnostic system. It appears on the dashboard as a symbol resembling a water tap, also referred to as the engine warning light. More importantly, OBD continuously monitors the engine's operating conditions to detect if the vehicle's exhaust emissions exceed standards, and it will issue an immediate warning if they do. 2. Can the vehicle still be driven with the OBD light on: Under normal circumstances, the OBD light rarely prevents the vehicle from starting, meaning the vehicle can still be driven.