Check Engine Light but No Codes: Common Reasons & Fix
Check Engine Light but No Codes. Learn the surprising reasons behind a MIL light with no DTC codes and how to diagnose this perplexing issue! In this video, I explain the leading reasons why your check engine light might be on but your OBD scanner isn't picking up any diagnostic trouble codes (DTCs).
As a seasoned mechanic with 20 years of experience, I've seen my fair share of automotive puzzles. A check engine light, also known as a malfunction indicator lamp (MIL), is your vehicle's way of telling you something's not quite right. It's like your car's version of a fever - a sign that something needs attention. But what happens when you've got that amber glow on your dashboard, yet your OBD scanner comes up empty? No codes, no clues, just confusion.
I'll walk you through the top reasons why you might face this "check engine light but no codes" conundrum. We'll explore everything from low-end OBD scanners that might miss certain codes, to intermittent issues that can trigger the light without setting a permanent code. I'll even explain how pending codes work and why some OBD scanners can detect these early warning signs while others can't.
But I don't just stop at explaining the "why" - I give you actionable steps to diagnose and address the problem. Whether you're dealing with a mysterious check engine light, struggling with an OBD scanner that's not showing codes, or just want to understand why you might have no OBD codes but the check engine light is on, this video has got you covered.
Disclaimer: This content is for educational purposes and should not replace professional advice. As an experienced mechanic, I aim to provide helpful insights, but I'm not liable for any damage or issues arising from the application of this information. Always consult a qualified mechanic for specific vehicle needs. Viewer discretion and responsibility are advised.
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