I’ve seen those runes a thousand times, and they’re not just warnings. They’re the engine’s way of pointing out a glitch, but if you read between the lines you can often find a sweet spot to squeeze more juice out. Think of a DTC as a breadcrumb—follow it, and you might hit a timing tweak, a fuel calibration, or even a sensor that’s barely within spec. Don’t treat them as a final verdict; treat them as a puzzle where the first piece usually says “something’s wrong” but the next ones can lead to a performance bump. Just don’t go hunting for a “secret rune” and forget to double‑check the basics—you’ll end up with more trouble than a single code.