1998 Toyota Corolla 1.8l 311,423 miles Ok. I've replaced the coolant temp sensor, replaced the o2 sensors, and the thermostat. What the hell else can it be???? I've been searching for months on how to fix this issue, and now, when the ecm reads from the sensor 207 on the ECT it's three quarters up the Gauge. I don't get it. I don't know what I'm missing. Coolant fans work. Thermostat is a OEM product. I'm replacing the ECT Sensor this weekend with a dealer part, but I'm at my wits end. Anyone that can help would be greatly appreciated!!!