Most car advice online is written by people who have never held a wrench.
I started Check Engine Light in 2024 after getting fed up with the same recycled misinformation showing up in search results for every code I tried to look up.
You've probably been there. The light comes on, you type the code into Google, and the top results tell you one of two things: either replace the most expensive part the code could possibly indicate, or try ten generic "fixes" that have nothing to do with your actual problem. Half of those articles were written by people who clearly learned about cars from other articles.
Check Engine Light is an attempt to do this differently. Every page on this site is written by someone who has actually diagnosed the problem in a shop. The prices are real prices from real invoices. The tool recommendations come from tools I own and use. When I say a code is usually caused by X but 40% of the time it's actually Y, those numbers come from the log of jobs I've done, not from someone's blog post citing another blog post.
The goal is simple: give you enough real information that you can either fix the car yourself, or know whether the shop quoting you $1,500 is being honest.