06/15/2026
Struggling to dial in your tune? The problem might not be your map, it might be an exhaust leak!
Even a tiny pinhole leak upstream of your O2 sensor can pull in fresh air. Your sensor reads that extra oxygen, thinks the engine is running dangerously lean, and tells your ECU to dump in extra fuel.
The result? Fouled plugs, terrible gas mileage, and endless frustration.
Don't tune around a mechanical issue. Before you spend hours chasing ghosts, make sure your exhaust is 100% sealed!