i had the service adviser at for the other day bugging me to get a defog i think to clean the intake or the cats, also a fuel injector preasure cleaning a fuel filter, and coolant flush. thna when i told her ill do it myself she started asking me if i was go9ng to do it at my house and just seemed real pushy. than they pu ton the reciept that i declined maintenance to my car and that invoice was sent to my waranty company. can that effect my warranty. alli went in for was a dfpe sensor change.