The car is experiencing unstable idling, poor drivability, bad fuel economy, etc. Yet a scan tool finds "NO DTC" and a tune scope dosen't give you any clue.
How frustrating! Definitely it's time to consider a leak. Do not hesitate to give it a try with Hanatech's Leak Detector. It will help you pin point the exact leaking location in a few minutes: 
Work efficiently. Be cost Effective. Save hours of wasted labor time. Hanatech, a brand leading high-tech diagnostic equipment manufacturer, has added the leak detector to its range of world famous diagnostic products. This quality product offers you a low tech / high tech solution with great new features.
It represnts fantastic value for money and will give you cost and labor time savings for years to come. 
Remember. The only way to start your diagnostics is back to basics

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