Certificate in Automotive OBD-II Diagnostics

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  • Course Duration4 months
  • Learning FormatOnline Learning

Course Overview

The Certificate in Automotive OBD-II Diagnostics is designed to provide learners with practical knowledge and technical skills required to understand, operate, and apply On-Board Diagnostics II (OBD-II) systems for automotive fault diagnosis. The program covers OBD-II principles, diagnostic connectors, electronic control units, diagnostic trouble codes, live data, vehicle sensors, emission monitoring systems, scan tools, fault-code interpretation, and systematic troubleshooting.

Learners will develop the ability to connect and operate diagnostic scan tools, retrieve and interpret diagnostic trouble codes, analyze live vehicle data, identify potential system faults, and support automotive inspection and repair activities. The program also introduces readiness monitors, freeze-frame data, emissions-related diagnostics, data communication, and appropriate diagnostic documentation.

Skills Covered

  • Fundamentals of automotive OBD-II diagnostics

  • OBD-II standards and operating principles

  • OBD-II diagnostic connector and pin configuration

  • Electronic Control Units (ECUs)

  • Vehicle diagnostic communication systems

  • Diagnostic Trouble Codes (DTCs)

  • Generic and manufacturer-specific fault codes

  • OBD-II diagnostic modes

  • Scan tool operation

  • Diagnostic code retrieval and clearing

  • Freeze-frame data analysis

  • Live data monitoring

  • Sensor data interpretation

  • Engine performance diagnostics

  • Fuel system diagnostics

  • Ignition system diagnostics

  • Emission control system diagnostics

  • Oxygen and air-fuel ratio sensor diagnostics

  • Mass airflow and manifold pressure sensor diagnostics

  • Throttle position sensor diagnostics

  • Engine temperature sensor diagnostics

  • Crankshaft and camshaft position sensor diagnostics

  • Fuel trim analysis

  • Misfire detection and diagnosis

  • Catalytic converter monitoring

  • Evaporative emission system diagnostics

  • Exhaust gas recirculation system diagnostics

  • OBD-II readiness monitors

  • Emission inspection and fault identification

  • Vehicle battery and charging voltage checks

  • Basic electrical and electronic diagnostics

  • Data communication and network-related diagnostic concepts

  • Diagnostic test procedures

  • Fault verification and confirmation

  • Systematic troubleshooting methods

  • Diagnostic reporting and service documentation

Why Join This Program?

  • Develop a strong foundation in modern automotive diagnostics.

  • Understand how OBD-II systems monitor vehicle operation.

  • Learn how to use automotive diagnostic scan tools effectively.

  • Develop practical skills for reading and interpreting DTCs.

  • Learn how to analyze live vehicle data and sensor information.

  • Understand freeze-frame data and its importance in diagnostics.

  • Develop knowledge of fuel, ignition, and emission system diagnostics.

  • Learn how OBD-II monitors vehicle emissions and system performance.

  • Understand readiness monitors and emission-related diagnostic information.

  • Develop systematic approaches to identifying automotive faults.

  • Improve diagnostic accuracy before replacing vehicle components.

  • Build skills applicable to automotive workshops, dealerships, inspection centers, and fleet maintenance operations.

Course Objective

The objective of this program is to develop practical knowledge and technical competence in automotive OBD-II diagnostics. Learners will gain an understanding of OBD-II architecture, diagnostic connectors, electronic control units, diagnostic trouble codes, live data, freeze-frame information, sensors, actuators, emission control systems, and diagnostic scan tools. The program aims to develop the ability to retrieve, interpret, and analyze diagnostic information and apply systematic troubleshooting techniques to support accurate automotive fault diagnosis and repair.

Learning Outcomes

Upon successful completion of the program, learners will be able to:

  • Explain the purpose and operating principles of OBD-II systems.

  • Identify the major components involved in vehicle diagnostic systems.

  • Locate and identify the OBD-II diagnostic connector.

  • Explain the role of Electronic Control Units in vehicle diagnostics.

  • Describe how vehicle systems communicate diagnostic information.

  • Identify and explain Diagnostic Trouble Codes.

  • Distinguish between generic and manufacturer-specific diagnostic codes.

  • Connect and operate an appropriate automotive diagnostic scan tool.

  • Retrieve and clear diagnostic trouble codes using a scan tool.

  • Access and interpret freeze-frame diagnostic information.

  • Monitor and interpret live vehicle data.

  • Identify the functions of common engine and emission sensors.

  • Analyze sensor readings to support fault identification.

  • Understand fuel trim information and its diagnostic significance.

  • Diagnose basic fuel and air management system faults.

  • Identify ignition-related fault symptoms using diagnostic information.

  • Analyze basic engine misfire-related diagnostic data.

  • Understand OBD-II emission monitoring systems.

  • Diagnose basic oxygen sensor and air-fuel ratio system issues.

  • Understand catalytic converter and emission system monitoring.

  • Identify basic evaporative emission system faults.

  • Explain OBD-II readiness monitors and their importance.

  • Apply systematic procedures for verifying suspected faults.

  • Use diagnostic information to support component testing and repair decisions.

  • Avoid unnecessary component replacement by applying structured diagnostic methods.

  • Document diagnostic findings and recommended corrective actions.

  • Apply appropriate safety procedures when performing vehicle diagnostic tests.

  • Carry out basic OBD-II diagnostic procedures in a structured and professional manner.

Why Choose London Technology College?

  • • Open to All – Whether you're brand new or brushing up your skills, our courses are designed to meet you where you are.
  • • Practical Approach – Learn by doing, with hands-on exercises that reflect real-world office tasks.
  • • Experienced Tutors – Our instructors bring real industry know-how and a passion for teaching.
  • • Certificate of Completion – Add an accredited certificate to your CV or LinkedIn profile to boost your job prospects.
  • • Flexible Learning Options – Study at your own pace, from anywhere in the world. Ideal for working professionals and international students seeking flexibility without compromising quality.
  • • Job-Ready Skills – Get trained in tools and techniques that employers actually look for.
  • • Support That Stays With You – Need help? Our team is here from start to finish—no question is too small.
  • • Learn at Your Own Pace – Take your time or move quickly—the course is designed to adapt to your needs.
  • • Hands-On Projects – Put your skills into action with tasks like reports, spreadsheets, resumes, and more.

Certificate of Completion

Earn a professional Certificate of Completion from London Technology College, demonstrating your newly acquired skills. This certificate is ideal for academic CVs, research proposals, and job applications in professional roles.

Earn Your Certificate in Certificate in Automotive OBD-II Diagnostics:

  • • Industry-recognised certificate issued by London Technology College.
  • • Demonstrate competence through real-world, practical projects.
  • • Validate your skillset for research, analytics, and professional careers.