So if outside air temperature decreases 30° from your last tire pressure adjustment, expect tire pressure to drop about 3 psi. If temperatures get particularly arctic, the rate at which tires deflate can be greater than the 1 psi per 10° rule of thumb. The low psi warning light pictured above was triggered on a -11° morning after a ~55 If your 2012 Fiat 500 uses an indirect system, the system must be reset using a magnet or scanning tool by either a dealer or one you have bought yourself. Some systems have a reset button inside the glove box that needs to be pressed and held down for three seconds with the ignition on. Inflate the tires. So few weeks ago I got this code that would not go away: service tire pressure monitoring system. I tried disconnecting the 12v battery multiple times but to no avail. So I ordered a TPMS module from here: Genuine OEM Fiat Tire Pressure Monitoring Module Part# 68214826ab Fits 2015-2018 Fiat 500: Up To 35% Off On Every Order And Guaranteed Fit As per UAE regulations, you will need to change your tires every five years after its purchase. In UAE, the legal tire depth for light vehicles is 1.6mm, for the medium-sized car is 2.4mm, and for heavy ones, like buses and trucks is 3.2mm. If you’re a resident of the UAE and looking for the best service provider to check your vehicle’s If all seems OK then just put a couple of extra pounds of pressure in each tyre, do the reset and go for a drive for 3 or 4 miles. If all OK reset the tyre pressure to the correct settings. Reset the vehicle again and that should be it sorted. If it comes back for no reason then one of the sensors is faulty. Tyre pressure init. at stop. The message is displayed during driving. If you want to reset the pressure of the four tyres, stop the vehicle. 1. Tyre pressure init. long press. To reset the pressure of all four tyres, with the vehicle stopped, press and hold the 5 OK switch to launch resetting until the “If pressure OK [hold on]” message is 1. Make sure all the tyres are at the correct pressure. 2. park on a level surface, ie not pointing up or down a hill or on a camber. 3. on your dashboard infotainment is a button ( looks like a flat tyre) press and hold this for a few seconds. Not sure if it makes a bleep or anything but the warning light should go out. Though the rule is easy to remember, it isn’t really accurate for all tires and can be closer to 2% per 10 degrees. This mostly affects you when the temperature drops in the late fall or winter Step 3: Turn on the Ignition. Once you have located the TPMS reset button, turn on the ignition without starting the engine. Make sure all doors are closed during this process. You should see various warning lights illuminate on the dashboard. chappy123. 54 posts · Joined 2012. #19 · Sep 24, 2013. I just had the TPMS System Unavailable light and message come on in my 2012 Rosso Sport. I have the GTR 17" rims with the proper sensors I got from 500 Madness, and for the last two months it has worked fine. yJKo8M.