Whats wrong?: The engine coolant temperature sensor may be cracked. This could cause the enging coolant temperature warning light to come on inadvertently and in rare cases may cause engine operating ...

hi, i have a problem with cold starting, glow plugs will not come on unless i unplug the temp sensor and i have changed every part including plugs, thermostat and temp sensor, glow plug time relay, ...

These symbols, often called "idiot lights," are aimed at being easy to understand. But for many drivers, young and old alike, it's not that easy.