MSS60 Error: 2B59, P0128
From Wiki-DIY
| Information saved in | DME |
| Fault code | 2B59 - P0128 |
| Fault text | Coolant thermostat monitoring |
| Fault description | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
| Condition for fault identification | Test condition: For the period K_TMOT_OBD_DIFF_T_DELTA the sensor deviates from the model by more than -25° Kelvin (K_TMOT_OBD_DIFF_HIGH)… |
| Terminal condition: Engine running | |
| Voltage condition: None | |
| Condition for fault memory entry | Once during warm-up phase |
| Action in service | 1. Replace thermostat |
| 2. Perform electrical check on coolant sensor and replace as indicated | |
| Fault effect and breakdown warning | Engine warms to normal operating temperature very slowly / ineffective interior heating / MIL on after engine runs 2x |
| Driver information | Warning light: MIL |
| Service instruction | None |
