I'm always reminded of a little kid... scrabbling around trying to hide something so Dad doesn't see it and give him what for...
Yes, we do warranty work on trucks with chips and pipes and <GACK>
these and we have denied warranty claims for some of these very reasons...
Each work order is treated on a case by case basis.... and there are ways that even us "low level" guys can find clues to what's going on as far as tuners are concerned. Guys should at least have the balls to be up front about everything.
Customer comes in with a P0603 and a "CLR_DIST" of 5 kms.... it probably wouldn't take much looking to find a programmer hidden away... Trouble is, disconnecting this stuff clears the very codes we would need to help us diagnose most concerns and makes that one or two week wait for an appointment a waste of time.
If a customer is going to disconnect something - do it at least a week before the appointed day... give codes a chance to reset...
Hiding stuff is an indication that somebody thinks they did something "bad"... May be... maybe not... But neither is it particularly hard to see a vehicle that has been abused in many different ways (if an experienced tech lifts your truck, it can be like a doctor looking down your underpants = there is stuff we can tell).
We have a new feature on OASIS.... Quick Start allows us to connect directly to OASIS from the truck.... The VIN and any trouble codes are automatically uploaded to Ford - and I really have no idea about what else may or may not be uploaded along with this stuff - and a report is generated immediately. We can also request hotline assistance right there from the IDS. I use it because it is quick and convenient and saves me a LOT of valuable time in my 10 to 12 hour work day.
The crux of the matter still centres around honesty and integrity... something even dishonest people will tell us is missing in todays society.