What are the reasons for a vehicle's OBD test failure?

1 Answers
MaciFitz
07/29/25 9:54pm
Reasons for a vehicle's OBD test failure: 1. The car's OBD system is too outdated and needs a system upgrade at a 4S shop; 2. There are faults in the car's system, which can be resolved by going to a 4S shop to troubleshoot, having the mechanic inspect and repair, then clearing the fault codes before retesting. OBD is the On-Board Diagnostics system, which monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, it immediately issues a warning. When a system fault occurs, the malfunction indicator lamp or check engine warning light will illuminate, and the Powertrain Control Module (PCM) stores the fault information in memory. Through a specific procedure, the fault codes can be read from the PCM.
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