Typical Malfunction Thresholds
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
P0128-00: JUDGMENT BY SIMULATED ENGINE COOLANT TEMPERATURE
| Duration that both of the following conditions are met | 5 seconds or more |
| (a) Estimated engine coolant temperature | 75°C (167°F) or higher |
| (b) Engine coolant temperature sensor output | Less than 75°C (167°F) |
P0128-07: JUDGMENT BY ENGINE COOLANT TEMPERATURE CHANGE AT HIGH VEHICLE SPEED
| Malfunction counter | 3 times or more |
| Malfunction counter is incremented when following conditions are met | A and B |
| A. Average engine coolant temperature change (vary with current engine coolant temperature, estimated ambient air temperature, intake air mass and vehicle speed) | Less than -0.15°C/sec (-0.27°F/sec) |
| B. Engine coolant temperature is satisfied throughout this period | Less than 75°C (167°F) |