EScan is the tool for intelligent mechanics. The first step in a diagnostic process is to base line the basic operations ,if the warm up cycle is not proper the fuel map gets skewed. With EScan you can start the diagnostic process by performing a correct coolant temp warm up cycle verification. Next you perform a test drive plotting fuel trims through the load ranges and verify volumetric efficiency. With this information alone you have the direction to make the diagnostic process more efficient. Not familiar with fuel trims or volumetric efficiency? ES scan has built in tutorial videos that explain it very well. This is but fraction of the EScan capabilities and also the tech support is the best I have experienced.