Thanks for the information sir, but just keep in mind that water will cause corrosion which you don't want on your vehicle. so the washing the under side of the vehicle is not recommended and should be avoided any way possible unless you drove through salty water, heavy mud, or a sand storm. plus on any vehicle made from 1990s til today will never accumulate dirt or anything near any important parts of you vehicle because you have the under tray, the fender walls, and the transmission skid plate. so no worries there. As for the tires pressure monitoring. Just fill them with nitrogen which going to cost you 20 Q.R. a tire if I'm not mistaken, but it's going to give you better gas mileage and it's less likely to expand under heat. Thanks again for the information Sir.