[regular guy]

2B59 - P0128

2B59 - P0128
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