how to fix the P0720 code on my BMW 3 Series F30/F31 (2012-2019)?

BMW 3 Series F30/F31 (2012-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0720

3 min read

465 words

Problem Statement

The P0720 code indicates a malfunction in the vehicle speed sensor circuit in a BMW 3 Series F30/F31 (2012-2019). This typically points to issues with the vehicle speed sensor, wi

Error Code

P0720

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.

Symptoms

•Check engine light illuminated
•Inaccurate speedometer readings
•Transmission shifting issues
•Unresponsive cruise control
•Poor fuel economy

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the vehicle speed sensor (VSS) wiring harness and connectors for damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within the manufacturer's specifications.
4
Test the voltage signal at the VSS connector while the vehicle is in motion.
5
Check the vehicle’s ECM for any software updates or faults.

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

•Remove any components obstructing access to the vehicle speed sensor.
•Visually inspect the sensor and wiring for signs of wear, fraying, or breakage.

Parts Required

•Vehicle speed sensor

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the vehicle speed sensor (VSS) wiring harness and connectors for damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within the manufacturer's specifications.
4
Test the voltage signal at the VSS connector while the vehicle is in motion.
5
Check the vehicle’s ECM for any software updates or faults.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a flat surface and the engine is turned off.
Disconnect the negative battery terminal to prevent electrical shock.

2. Locate and Inspect the Vehicle Speed Sensor

Tools Required: Socket set, torque wrench, multimeter.
Remove any components obstructing access to the vehicle speed sensor.
Visually inspect the sensor and wiring for signs of wear, fraying, or breakage.

3. Test the Vehicle Speed Sensor

Use a multimeter to check the resistance across the sensor terminals. Refer to the vehicle’s service manual for the specific resistance values.
If the resistance is out of specifications, proceed to replace the sensor.

4. Replace the Vehicle Speed Sensor

Disconnect the electrical connector from the VSS.
Remove the sensor from its mounting location (typically held in place by screws or bolts).
Install the new vehicle speed sensor, ensuring it is seated properly.
Reconnect the electrical connector and ensure it clicks into place.

5. Reassemble and Reconnect

Reattach any components that were removed to gain access to the sensor.
Reconnect the negative battery terminal.
Start the vehicle and allow it to idle for a few minutes.