The P0118 code means that the engine control module (ECM) has detected a voltage signal that’s too high from the engine coolant temperature (ECT) sensor (below). In practical terms, the ECM believes ...

I bought a new Mercedes- Benz A180 in 2014 and had no problems for 12 months until the first service when a message appeared, "Add coolant, if on a slope". On a longer drive the temperature gauge ...