How do you use a digital volt-ohm meter to diagnose a car electrical problem?

A DVM measures voltage, resistance, and continuity to help locate issues such as weak batteries, poor grounds, blown circuits, and faulty wiring.

What does a bad oxygen sensor do to a vehicle?

A faulty oxygen sensor can cause poor fuel economy, increased emissions, rough running, and an illuminated check-engine light.

Why is wheel alignment needed after replacing suspension parts?

Suspension work can alter wheel angles. Alignment restores proper handling, reduces uneven tire wear, and helps keep the vehicle tracking straight.

Free online course Vehicle Maintenance

Duration of the online course: 12 hours and 3 minutes

New

Boost your automotive repair skills with a free online course in vehicle maintenance—diagnostics, brakes, alignment, sensors, and more, with exercises included.

In this free course, learn about

Using a DVM to diagnose electrical issues: measuring voltage, resistance, continuity, and current
Brake master cylinder role: converting pedal force into hydraulic pressure for the brake system
Disc brake fundamentals: pad/rotor interaction, heat management, and common wear/inspection points
Purpose of brake-pad slots: venting dust/gases, reducing noise, and helping prevent glazing
Sway bar function: reducing body roll by linking left/right suspension movement for stability
Oil pressure basics and why regular oil changes prevent wear, sludge, and lubrication breakdown
Why wheel alignment matters after tires/suspension work: restoring angles to prevent pull and wear
O2 sensor diagnostics: how sensors help control fuel mixture and support emissions performance
Shifter/short-shifter principles: reduced throw and quicker, more direct manual gear changes
Fuel injection basics: how fuel delivery is metered and controlled for power, economy, and emissions
Why gasoline is used: high energy density and performance despite cost and volatility
Aero/mono-beam wiper advantages: more even pressure, better high-speed wiping, and improved durability
Starter system maintenance and Charles Kettering’s key contribution: the electric starter motor
Fender replacement/paint prep: proper metal surface preparation (cleaning, sanding, priming) for adhesion

About the free online course

Reliable vehicles start with informed maintenance. This free online course helps you build practical automotive repair skills by understanding how key systems work, how they fail, and how to approach problems with confidence. Whether you maintain your own car, want to communicate better with mechanics, or are exploring professional skills in automotive repair, you will learn a clear, real-world way of thinking: observe symptoms, verify causes, and make safer, smarter decisions.

You will strengthen your troubleshooting mindset through lessons that connect common complaints to the underlying systems. Learn how electrical diagnostics supports modern repairs and how a digital volt-ohm meter becomes an essential tool for identifying voltage drops, poor grounds, and circuit issues. Move from electronics to braking fundamentals by understanding the purpose of the master cylinder, the role of disc brakes, and why features like brake pad slots exist in certain designs. The course also highlights suspension and handling concepts, including how sway bars influence stability and why alignment matters after tire changes or suspension work.

Maintenance is not only about replacing parts; it is about protecting performance and preventing costly damage. You will explore why regular oil changes matter for engine life, how oxygen sensors contribute to efficient operation and emissions control, and what fuel injection concepts imply for drivability. You will also look at driver-focused components, such as shifters, and how upgrades like short shifter mechanisms affect feel and precision. Practical care extends outward as well, from choosing modern aero-style wipers for better visibility to understanding starter maintenance and the historical innovations that shaped today’s vehicles.

Finally, the course connects mechanical know-how to the broader responsibilities of automotive work, including surface preparation considerations for body repairs and a safety-minded look at airbags. Short exercises reinforce key ideas so you can check your understanding and apply what you learn to everyday vehicle ownership or entry-level repair contexts. By the end, you will be better equipped to diagnose issues, plan maintenance, and build credible, job-relevant automotive knowledge.

Course content

Video class: Car Corner - Electrical Diagnostics 51m
Exercise: What is the primary role of a digital volt-ohm meter (DVM) in automotive diagnostics?
Video class: Car Corner Master Cylinder 59m
Exercise: What is the primary function of a brake master cylinder in a vehicle's braking system?
Video class: Car Corner Disc Brakes 2014 59m
Exercise: What is the primary purpose of the slot found in some brake pads?

Video class: Car Corner Sway Bar 55m
Exercise: What is the primary function of a sway bar in a vehicle's suspension system?
Video class: Car Corner Oil Pressure 55m
Exercise: Why is it important to change engine oil at regular intervals?
Video class: Car Corner: Alignment 54m
Exercise: Why is it important to perform a wheel alignment after changing tires or suspension components?

Video class: Car Corner: O2 Sensor Diagnostics 49m
Exercise: What is one of the primary functions of an oxygen sensor in modern vehicles?
Video class: Car Corner: Shifters 59m
Exercise: What is the main advantage of installing a short shifter mechanism in a car's manual transmission?
Video class: Car Corner: Fuel Injection 59m
Exercise: What is a primary reason for using gasoline as a fuel source despite its high cost?

Video class: Car Corner: Windshield 59m
Exercise: What are some advantages of the newer 'aero style' or 'mono beam' windshield wipers compared to the older design?
Video class: Car Corner: Starter Maintenance 54m
Exercise: What was a significant contribution of Charles Kettering to automotive technology?
Video class: Car Corner: Fender Replacement 56m
Exercise: Which of the following is considered a necessary step when preparing a metal surface on a car for painting?
Video class: Car Corner: Airbags 49m