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P0128 Diagnostic Trouble Code Discussion for March 2014

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on, Low coolant temp VIN: SALMF15416
P0128: Coolant temp below operating range. ... this post! Code P0128. Should be a simple fix, put in a thermostat. 3 thermostats installed aftermarket and OE, still same results. Coolant temp 120-140 degrees(F), low coolant temp reading on gauge on instrument cluster, and very poor heat. Checked coolan...
March 17, 2014
2002 Mercedes-Benz C320 3.2L Poor Idle Quality, Hesitation, Surge VIN: WDBRH64JX2
P0128: coolant thermostat. Vehicle has a slight hesitation noticeable under moderate accel to wot. O2s go lean under wot accel. Customer also states intm rough idle/stalling while stopped or coming to a stop, I have not noticed that yet. No codes besides t-stat. I'm leaning toward a mas...
March 21, 2014