We're a bunch of car enthusiasts at 1A Auto, plain and simple. Between us, we have decades of automotive experience from working on and fixing vehicles, buying parts, and from just living and breathing everything about automobiles and trucks. Now, we want to share all of the expertise and knowledge we have accumulated over that time with you! Here you'll find a wealth of automotive resources including 101s on parts, repair and maintenance tips, buying guides, information about makes and models, general help, and much more.

NASCAR Driver Spencer Boyd and 1A Auto Partnership

Empower Video Series

Car Knowledge 101

General Knowledge

Car Part Terminology
OEM vs Aftermarket Auto Parts

Understanding Vehicle Identification Numbers / "VIN Numbers"
Understanding Truck Body Styles
Low Tire Pressure in Cold Weather
Tire Size Guide
What is OBD II and how does it work?
Short Ram Vs. Cold Air Intake Systems
Why Do Car Batteries Die in Cold Weather?

Part-Specific Knowledge

Wheel Hub

Wheel Hub & Bearing Guide

Steering and Suspension

Shocks Vs. Struts
Control Arm Basics
Power Steering 101: What is it and How it Works

Lighting - Headlights, Tail Lights, Fog Lights, and Corner Lights

Replacement Headlights
Replacement Tail Lights
Replacement Fog / Driving Lights
Parking, Corner, Side Marker, Turn Signal, Bumper, Repeater Lights & Reflectors Guide


Replacement Side View Mirrors
Towing Mirrors Guide


Timing Belts Vs. Timing Chains
Exhaust Manifolds Vs. Headers
Ignition Coils & Coil Packs
Exhaust Manifolds 101
Alternators 101
Auto Radiators 101
Starter Motor 101
How Fuel Injection Systems Work
Distributor Ignition Systems Explained


Automotive Differentials Explained
What is The Difference Between Four Wheel Drive and All Wheel Drive?


What is a MAP Sensor & What does a MAP Sensor do?
MAP vs. MAF vs. IAT Sensors
Crankshaft Position Sensors


Oxygen Sensor Basics


Weatherstripping 101

Troubleshooting and How-to Help

Find answers to your part-specific questions

Wheel Hubs

What Is a Wheel Hub?
Bad Wheel Bearing Symptoms
What Does a Bad Wheel Bearing Sound Like?
What Is a Wheel Bearing?
How to Tell Which Wheel Bearing Is Bad While Driving
Is It Safe to Drive with a Bad Wheel Bearing?
What Happens When a Wheel Bearing Goes Out?


What are the Different Types of Automotive Brakes?
How Long Do Brakes Usually Last?
Are Brake Pads Universal?
How Much Does It Cost to Replace Brake Pads?
When Should Brake Pads Be Replaced?
Why Are My Brakes Squeaking?
Do I Need to Turn Rotors When Changing Brake Pads?

Steering and Suspension

Why Does My Steering Wheel Shake When I Drive?
Bad Shocks & Struts Symptoms
What Are Front Struts?
When Should Shocks & Struts Be Replaced?
How Do I Know if I Have Shocks or Struts?
How Many Miles Do Struts Last?
What is the Difference Between Shocks and Struts?
What Are the Different Types of Shocks?
Can You Drive a Car with Leaking Struts?


How to Adjust & Aim Headlights
What Are Low Beam Headlights?
Why Are My Headlights Dim?
How Long Do Headlights Last?
Is It Illegal to Drive with a Headlight Out?

Tail Lights
Are Tail Lights and Brake Lights the Same Bulb?
Why Are My Brake Lights Staying On?
Why Won't My Tail Lights Turn Off?

Side Mirror

How Much Does It Cost to Replace a Side Mirror?

Window Regulator

What Does a Window Regulator Do?
Why Are My Power Windows Working Intermittently?


What are the Different Types of Fuel Injection Systems?
What is The Difference Between Flat Plane and Cross Plane Crankshafts?
What to Do When Your Car Overheats
What is a Cylinder Head and How Does it Work?


What Fluid is Leaking From My Car?
How Often Should You Change Your Oil?


Can a Bad O2 Sensor Cause a Misfire?

Makes, Models, Automotive Companies and Part Brands

History of General Motors (GM)
11 Common Jeep Problems & Complaints - Death Wobble
Honda Accord Brake Problems - Cause & Solution


Same Day Shipping

In stock orders ship same day when ordered by 2pm ET. Need your part faster? Choose expedited shipping at checkout.


Guaranteed to Fit

Our team of auto experts work hard to provide you with the highest quality, direct fit replacement auto parts. We know not all auto parts are created equal. This is why we enforce a strict level of product standards and sourcing with every part.


USA Customer Support

Our goal is to exceed our customers' expectations every day. We are a team of passionate auto enthusiasts who are here to help. If you have a question about our parts or a repair contact us.


Instructional Video Library

Our 1A Auto Video Library has thousands of how-to auto repair installation videos specific to year, make and model. Each video guides you with step-by-step instructions to empower you to tackle your own repairs on your car, truck, SUV, or van.