Symptoms of a Bad or Failing ECM-Power Relay. The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems.
1 Replace the tire if the top of Abe's head becomes uncovered by any of the grooves.  If your tires are only partially worn, find out how much. Stick a tread-depth gauge (about $5 at auto-parts stores) into each of the grooves on all four tires, as shown in the photo below. Then check how many inches of usable tread remain and match your driving to the tread wear.
But age is not the only factor. Tread matters too. A worn tire can be just as dangerous, or even more so, than one that is simply old. While the minimum safe tire tread depth is 2/32â³, consider replacing your tires at the 4/32â³ mark, especially if you drive in rainy and snowy conditions.