ECO OBD2 device gathers data over the next 150 miles covered. After the 150 miles, ECO OBD2 chip is able to collect enough data needed to modify your vehicle’s computer for less fuel consumption.

So you have to check the result after you plug the ECO OBD2 and run over 150 miles to get the result of the ECO OBD2 device.

If you are not satisfied with our product, you can return it within 30 days. Anyway the product must not open and already used.

Thank you for your understanding.