How can I fix a faulty engine temperature sensor in a 2020 Ford Explorer?

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0117, P0118

4 min read

719 words

Problem Statement

Learn how to diagnose and replace a faulty engine temperature sensor in a 2020 Ford Explorer, including symptoms, diagnostic steps, and tools required.

Error Code

P0117, P0118

Affected Component

engine temperature sensor

Estimated Time

2-3 hours

Symptoms

•Check Engine Light
•Erratic Temperature Gauge
•Poor Engine Performance
•Overheating

Diagnostic Steps

1
Connect OBD-II Scanner
2
Scan for Codes
3
Visual Inspection
4
Test the Sensor

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II Scanner
•Multimeter
•Basic hand tools (sockets, wrenches)
•Torque wrench
•Replacement engine temperature sensor
•Safety gloves and goggles
•Shop manual (optional for specific torque specifications)

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Fixing a Faulty Engine Temperature Sensor in a 2020 Ford Explorer

Tools Required

OBD-II Scanner
Multimeter
Basic hand tools (sockets, wrenches)
Torque wrench
Replacement engine temperature sensor
Safety gloves and goggles
Shop manual (optional for specific torque specifications)

Step 1: Scan for Error Codes

Connect OBD-II Scanner: Locate the OBD-II port under the dashboard near the driver's side.
Scan for Codes: Use the scanner to read any diagnostic trouble codes (DTCs).
- Look for codes related to the engine temperature sensor, such as P0117 (Engine Coolant Temperature Sensor Circuit Low Input) or P0118 (Engine Coolant Temperature Sensor Circuit High Input).

Step 2: Visual Inspection

Safety First: Ensure the engine is cool before proceeding.
Locate the Sensor: The engine temperature sensor is typically located near the thermostat housing on the engine block.
Inspect Connections: Check the electrical connector for any signs of corrosion, damage, or loose connections.
Wiring Check: Inspect the wiring harness for frays or breaks.

Step 3: Test the Sensor

Disconnect the Sensor: Unplug the electrical connector from the engine temperature sensor.
Set Up Multimeter: Switch the multimeter to the resistance (ohms) setting.
Measure Resistance: Connect the multimeter probes to the sensor terminals.
- Cold Engine: Resistance should be high (typically around 2,000 - 3,000 ohms at 0°C/32°F).
- Hot Engine: Resistance should decrease (typically around 200 - 300 ohms at 100°C/212°F).
Compare Readings: If the readings are outside the specified range, the sensor is faulty and needs replacement.

Repair Instructions

Step 4: Replace the Engine Temperature Sensor

Gather Tools: Ensure you have all necessary tools and a replacement sensor.
Drain Coolant (if necessary): If your sensor is located in a place that requires coolant removal, drain the engine coolant into a clean container.
Remove Old Sensor:
- Using the appropriate socket, carefully unscrew the old engine temperature sensor.
- Be cautious of any remaining coolant that may spill out when removing the sensor.
Install New Sensor:
- Apply a small amount of thread sealant (if recommended) to the threads of the new sensor.
- Screw in the new sensor by hand first, then tighten it using a torque wrench to the manufacturer’s specified torque (typically around 15-20 ft-lbs, but refer to the shop manual for specifics).
Reconnect Electrical Connector: Plug in the connector to the new sensor until it clicks securely.
Refill Coolant (if drained): If you drained the coolant, refill the cooling system with the appropriate type of coolant for your vehicle.
Bleed the Cooling System: If necessary, bleed any air from the cooling system according to the vehicle service manual instructions.

Step 5: Final Checks

Reconnect Battery: If you disconnected the battery, reconnect it.
Erase Codes: Use the OBD-II scanner to clear any error codes and reset the check engine light.
Start the Engine: Start the engine and allow it to reach operating temperature.
Monitor Temperature Gauge: Check the temperature gauge behavior. It should stabilize within normal operating range.
Check for Leaks: Inspect the sensor area and coolant system for any leaks.

Step 6: Test Drive

Perform Test Drive: Take the vehicle for a test drive to ensure everything is functioning properly.
Monitor Performance: Pay attention to engine performance and gauge readings during the drive.

Conclusion

Replacing a faulty engine temperature sensor in a 2020 Ford Explorer involves diagnosing the sensor's functionality, replacing it with a new component, and ensuring everything is working correctly. Following these steps will help ensure the repair is successful and restore proper engine operation. If issues persist, further diagnostics may be required to explore other potential causes.