Coolant Temperature Sensor Replacement DIY


  • Temperature needle in dash intermittently drops down to zero
  • Improper function of cooling system (system reports zero so fans don’t go on)

ECU Scan results:

  • 01039 – Coolant Temperature Sensor (G2) 30-10 – Open or Short to Plus – Intermittent


  • Allow the engine and coolant to be completely cold or you can burn yourself.
  • Open and close the coolant reservoir cap to release any built up pressure.
  • You will loose coolant, be sure to have some in case you need to top off.
  • I’m not responsible for anything. Use this at your own risk.

Required Tools:

00 - Required Tools

  • Ratchet
  • 6mm allen socket
  • T30 Torx socket
  • 2x Long zip ties
  • Screw driver or tool to pull sensor clip
  • Tool to cut zip ties when done

1- Using your T30 Torx socket and ratchet, remove the intake manifold shift rod drive unit.


2- Lay it down in the bay to the right, there is no need to disconnect the cable.


3- Remove hose from the valve.


4- Remove first retaining clip and zip tie the tubing out of the way.


5- Zip tie previously disconnected hose from step 03 out of the way.


6- Using your 6mm allen socket and ratchet, remove the engine bracket.


7- Now that everything is out of the way, prepare your new coolant temperature sensor, put the O ring on it and have it handy.


8- Hold the old sensor in place (cable still connected) and remove the retaining clip. Remove the sensor (ensuring the O ring is on it and not stuck inside), quickly insert the new sensor with O ring to stop coolant from leaking and insert the retaining clip.


9- Now that the most stressful part is over and you have coolant all over the place, remove the harness from the old sensor and attach it to the new one.


10- Clean up with rags as much as you can and cut both zip ties. Put everything back together in the following order: engine bracket, hose, harness, intake manifold shift rod drive unit.

Now take her for a test drive, the temp needle should slowly got up to temp and stay there the entire time. Optionally you can clear codes and scan again after a few days of driving to see if the issue is still being reported.

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