[77newell]

Since the sensors create a drop in voltage on the sensor line to the ECU, if the battery voltage is low there will be a sensor line that is the first to trigger a warning. The other sensors lines aren't quite there yet, as the battery voltage drops, someone will trigger first. This is where we need to put our thinking caps on. While the warning says, say, low coolant level, what it is really saying is: "Hey, I'm sensing low voltage over here, check it out". The interpretation of the voltage signal is usually right, but when it isn't we have to think about how the voltage could be low. One possibility is that the battery is low.