how to fix the Tesla Model 3 Original (2017-2023) radar sensor not found error

Tesla Model 3 Highland (2024-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

540 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix the Radar Sensor Not Found error in Tesla Model 3 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems to prevent shocks or shorts.
•Ensure the vehicle is on a stable surface to prevent it from rolling during repairs.

Symptoms

•Radar Sensor Not Found error message displayed on the screen
•Adaptive cruise control not functioning
•Autopilot features disabled
•Collision avoidance system inactive
•Warning chimes or alerts related to sensor malfunction

Diagnostic Steps

1
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the radar sensor.
2
Inspect the radar sensor visually for any physical damage or obstruction (dirt, ice, etc.).
3
Verify the radar sensor's electrical connections for corrosion or loose wiring.
4
Perform a software update through the Tesla interface to ensure the latest firmware is installed.
5
Check the radar sensor's alignment using the Tesla service manual specifications.
6
Inspect the vehicle’s front fascia for any signs of damage that could affect radar sensor positioning.

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
•Socket set
•Electrical contact cleaner
•Cleaning cloth

Parts Required

•Radar sensor (if found faulty)
•Front bumper clips/screws (if damaged during removal)

Related Faults

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Diagnostic Steps

1
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the radar sensor.
2
Inspect the radar sensor visually for any physical damage or obstruction (dirt, ice, etc.).
3
Verify the radar sensor's electrical connections for corrosion or loose wiring.
4
Perform a software update through the Tesla interface to ensure the latest firmware is installed.
5
Check the radar sensor's alignment using the Tesla service manual specifications.
6
Inspect the vehicle’s front fascia for any signs of damage that could affect radar sensor positioning.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and turned off.
Disconnect the 12V battery to avoid electrical shorts during repair.

2. Access the Radar Sensor

Remove the front bumper cover:
- Use a socket set to remove screws and clips securing the bumper.
- Carefully detach the bumper from the vehicle, taking care not to damage any clips.
Locate the radar sensor, which is typically mounted behind the front grille.

3. Inspect and Repair

Inspection:
- Check the radar sensor for physical damage.
- Clean the sensor surface with a gentle cloth and appropriate cleaner to remove dirt or debris.
Electrical Connections:
- Disconnect the radar sensor connector.
- Inspect for corrosion or damage on the connector pins.
- Clean the connectors with electrical contact cleaner if necessary.
Reconnection:
- Reconnect the sensor once inspected and cleaned.

4. Reassemble

Reattach the front bumper cover:
- Align the bumper properly with the vehicle body.
- Secure with screws and clips removed earlier, ensuring everything is fastened tightly.

5. Test the System

Reconnect the 12V battery.
Start the vehicle and check for any error messages.
Conduct a test of the radar-dependent features (adaptive cruise control, Autopilot).