Car Diagnostic Blog
How to Check Car Recalls for Free (No VIN Needed)
Learn how to run a free car recall check, why safety recalls matter, and how the Lewis app matches your car to open NHTSA recall campaigns by year, make, and model, no VIN or scanner needed.
P0171 Code: Meaning, Causes, and How to Fix It
P0171 means your engine is running lean on Bank 1. Learn what the code means, the most common causes, how serious it is, and how to diagnose and fix it.
Check Engine Light On: What It Means and What to Do
Your check engine light is on. Learn what it means, which warning signs mean stop driving, why a flashing light is different from a steady one, and the exact steps to find the cause.
How to Read Car Trouble Codes for Free
You can read your car's trouble codes for free without a mechanic. Learn the free ways to pull OBD2 codes, what you need, and how to actually understand what they mean.
Pre-Purchase Inspection: How to Scan Any Used Car Before You Buy
A pre-purchase inspection can save you thousands on a used car. Learn what a PPI covers, how an OBD2 scan of the car's computers works, and how Lewis turns the results into a negotiation guide.
The Lewis OBD2 Scanner Is Coming Soon: Plug In and Get a Year of Pro
A first look at the upcoming Lewis OBD2 Bluetooth scanner: a plug-and-play scanner made to pair with the Lewis app and bundled with a full year of Lewis Pro.
AI Car Diagnostics vs Traditional OBD2 Apps: Which Should You Choose?
Compare AI-powered car diagnostic apps with traditional OBD2 scanners. Learn why AI diagnostics provide better insights, accuracy, and value for car owners.
Best Car Diagnostic Apps in 2026: Complete Guide to OBD2 Scanner Apps
Compare the top car diagnostic apps for iPhone and Android. Find the best OBD2 scanner app with AI-powered diagnostics, live data, and repair cost estimates.
How to Read Car Diagnostic Codes: Complete Step-by-Step Guide
Learn how to read OBD2 trouble codes with your smartphone. Step-by-step guide to understanding check engine light codes and what they mean for your car.
What is OBD2? The Complete Guide to Car Diagnostics
Learn what OBD2 is, how it works, and why every car has it. Complete guide to on-board diagnostics, port locations, and using OBD2 for car maintenance.