Coolant Temperature Below Operating Range


Table of contents

P0128 AUDI Possible Causes

  • Leaking or stuck open thermostat
  • Low engine coolant level
  • Insufficient warm up time
  • Faulty engine coolant temperature sensor
  • Engine coolant temperature sensor harness is open or shorted
  • Engine coolant temperature sensor circuit poor electrical connection

How do I fix code P0128 AUDI?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Tech Notes

  • If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

Cost of diagnosing the P0128 AUDI code

  The cost of diagnosing the P0128 AUDI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected

  The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0128 AUDI Description

  Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

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