Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If the cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
To diagnose the P0128 Lexus code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. The Engine Control Module (ECM) then compares the estimated temperature with the actual engine coolant temperature. When the estimated engine coolant temperature reaches 75°C (167°F), the ECM checks the actual engine coolant temperature. If the actual engine coolant temperature is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and stores the Diagnostic Trouble Code (DTC).
Need more information on how to fix the P0128 Lexus code? Get Access to Factory Service Manuals
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