Typical Malfunction Thresholds
WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. 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 -0.03°C/sec (-0.054°F/sec) |
| B. Engine coolant temperature is satisfied throughout this period | Less than 75°C (167°F) |