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1.Remove the engine coolant temperature sensor using the special tool engine coolant temperature
sensor wrench (MB992042).
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2.With temperature sensing portion of engine coolant temperature sensor immersed in hot
water, check resistance. Standard value:
14 - 17 kΩ (at -20°C) 5.1 - 6.5 kΩ (at 0°C) 2.1 - 2.7 kΩ (at 20°C) 0.9 - 1.3 kΩ (at 40°C) 0.48 - 0.68 kΩ (at 60°C) 0.26 - 0.36 kΩ (at 80°C)
3.If the resistance deviates from the standard value greatly, replace the sensor.
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4.Apply sealant to threaded portion. Specified sealant:
3M NUT Locking Part No. 4171 or equivalent
5.Tighten the engine coolant temperature sensor to the specified torque using the special
tool engine coolant temperature sensor wrench (MB992042). Tightening torque: 29 ± 10 N·m
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