Which tool is commonly used to read diagnostic trouble codes from a vehicle's computer?

Which tool is commonly used to read diagnostic trouble codes from a vehicle's computer?

• A. Diagnostic scan tool
• B. Microscope
• C. Tachometer
• D. Harmonic balancer puller

Answer: (A)

Reading diagnostic trouble codes stored in a vehicle’s onboard computer requires a diagnostic scan tool. These devices connect to the car’s OBD-II port and communicate with the engine control unit to pull the trouble codes, display live sensor data, and often clear codes after repairs. The other tools aren’t used for reading codes: a microscope is for inspecting tiny parts, a tachometer measures engine RPM, and a harmonic balancer puller is a mechanical tool for removing the crankshaft pulley. In practice, you’d use a diagnostic scan tool (or OBD scanner) to read and interpret DTCs and guide troubleshooting.

Reading diagnostic trouble codes stored in a vehicle’s onboard computer requires a diagnostic scan tool. These devices connect to the car’s OBD-II port and communicate with the engine control unit to pull the trouble codes, display live sensor data, and often clear codes after repairs. The other tools aren’t used for reading codes: a microscope is for inspecting tiny parts, a tachometer measures engine RPM, and a harmonic balancer puller is a mechanical tool for removing the crankshaft pulley. In practice, you’d use a diagnostic scan tool (or OBD scanner) to read and interpret DTCs and guide troubleshooting.