SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSLEXUS2010LS 460L AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (DIAGNOSTIC CODES (P0010-P0308)SFI SYSTEMDTC P0125: INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROLPROCEDURE
2010 Lexus LS 460L AWD

DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control: Procedure

2010 Lexus LS 460L AWDSECTION Procedure
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read DTCs.

      Result

      Display (DTC Output) Proceed to
      P0125 A
      P0125 and other DTCs B

      HINT: 

      If any DTCs other than P0125 are output, troubleshoot those DTCs first.

    B → See step   4 

    A: Go to next step 

  2. INSPECT WATER INLET WITH THERMOSTAT 
    1. Remove the water inlet with thermostat. Refer toREMOVAL .
    2. Check the valve opening temperature of the thermostat.

      Standard

      80 to 84°C (176 to 183°F)

      HINT: 

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

    NG → See step   5 

    OK: Go to next step 

  3. CHECK COOLING SYSTEM 
    1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.

    NG → REPAIR OR REPLACE COOLING SYSTEM 

    OK → See step   6 

  4. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART 
  5. REPLACE WATER INLET WITH THERMOSTAT. Refer to REMOVAL 
  6. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to REMOVAL 
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.