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2B59 - P0128
| Information saved in
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DME
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| Fault code
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2B59 - P0128
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| Fault text
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Coolant thermostat monitoring
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| Fault description
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Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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| Condition for fault identification
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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)…
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Terminal condition: Engine running
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Voltage condition: None
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| Condition for fault memory entry
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Once during warm-up phase
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| Action in service
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1. Replace thermostat
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2. Perform electrical check on coolant sensor and replace as indicated
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| Fault effect and breakdown warning
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Engine warms to normal operating temperature very slowly / ineffective interior heating / MIL on after engine runs 2x
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| Driver information
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Warning light: MIL
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| Service instruction
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None
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