Originate or partner with car manual publishers and combine multiple sensor data to give most probable causes, prioritized, and tie this to online or downloadable text and video to better enable driver troubleshooting and avoid going to a mechanic. The car manual publishing business charge draconian prices, unjustified when distributed outside of the paper press's considerable distribution costs. Make these PDFs or media rich iBooks with embedded video. This would give you an additional revenue stream by adding considerable value. This approach would potentially exceed the average mechanics diagnostic abilities and protect the consumer from being billed for work done based on a "wrong why" whether based on criminal scamming or ineptitude.