Hello Dean,
Thank you for your feedback.
As we discussed on the phone, a lean reading can be the result of a number of reasons such as free air entering the exhaust stream trough a bad gasket or a hole in the exhaust. This has happened unbeknownst to the user on some previous occasions. Mishandling of the sensor like dropping it, or blasting it with oil from the exhaust can also lead to anomalous readings.
For these reasons, it is not possible for us to remotely determine the cause of the unexpected reading, all we can say for sure is that your device like all others, left our shop fully tested and in working order, and is covered under our warranty terms.
We have provided telephone support to assist with finding the cause of the problem, and offered to bench test the device, which you declined due to 'not having time'. We also offered to declare a dead-on-arrival case for the sensor, in consideration of the limited time use, had it been found faulty and without any obvious signs of damage.
It is regrettable that you have opted to instead dispose of the device whilst still under warranty, as we would likely had resolved any issue by now and at no cost to you.
It is of course your prerogative to dispose of your device as you wish, but we respectfully disagree with your assertion that no help was offered.
All the best,
Ray