how to fix tire pressure monitoring system (TPMS) errors in BMW 3 Series G20/G21 (2019-2024)

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

581 words

Problem Statement

The Tire Pressure Monitoring System (TPMS) in a BMW 3 Series G20/G21 (2019-2024) is displaying errors, indicating potential issues with tire pressure readings or sensor functional

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems if replacing sensors.
•Allow the vehicle to cool down before handling tires after driving.

Symptoms

•TPMS warning light illuminated on the dashboard
•Inaccurate tire pressure readings displayed
•Frequent loss of tire pressure notifications
•Difficulty resetting the TPMS
•Warning messages regarding tire pressure on the infotainment display

Diagnostic Steps

1
Scan for Error Codes**: Use an OBD-II scanner to check for any stored error codes related to the TPMS.
2
Visual Inspection**: Inspect all tires for visible damage or abnormal wear that may affect pressure.
3
Check Tire Pressures**: Manually check the tire pressures using a reliable tire pressure gauge.
4
Inspect TPMS Sensors**: Examine the sensors for physical damage or corrosion, especially around the valve stem.
5
Test Sensor Functionality**: Use a TPMS tool to activate and read sensor signals to confirm they are functioning properly.
6
Verify Battery Life**: Check the battery life of the TPMS sensors; replace if necessary, as they typically have a lifespan of 5-10 years.

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
•Tire pressure gauge
•TPMS tool
•Jack
•Jack stands
•Torque wrench

Parts Required

•Replacement TPMS sensors (if damaged or non-functional)

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Diagnostic Steps

1
Scan for Error Codes**: Use an OBD-II scanner to check for any stored error codes related to the TPMS.
2
Visual Inspection**: Inspect all tires for visible damage or abnormal wear that may affect pressure.
3
Check Tire Pressures**: Manually check the tire pressures using a reliable tire pressure gauge.
4
Inspect TPMS Sensors**: Examine the sensors for physical damage or corrosion, especially around the valve stem.
5
Test Sensor Functionality**: Use a TPMS tool to activate and read sensor signals to confirm they are functioning properly.
6
Verify Battery Life**: Check the battery life of the TPMS sensors; replace if necessary, as they typically have a lifespan of 5-10 years.

Solution

1. Preparation

Tools Required: OBD-II scanner, tire pressure gauge, TPMS tool, jack, jack stands, torque wrench, replacement TPMS sensors (if needed).
Safety Warnings: Ensure the vehicle is on a flat surface and secure it with wheel chocks before lifting.

2. Resetting the TPMS

Sub-steps:
1. Turn on Ignition: Insert the key fob and turn the ignition to the "On" position without starting the engine.
2. Access TPMS Menu: Navigate to the vehicle settings on the infotainment system.
3. Select TPMS Reset: Choose the option to reset the TPMS.
4. Confirm Reset: Follow the prompts to confirm the reset and wait for the system to recalibrate.

3. Replacing TPMS Sensors (if necessary)

Sub-steps:
1. Lift Vehicle: Use a jack to lift the vehicle and secure it with jack stands.
2. Remove Wheel: Loosen the lug nuts using a socket set and remove the wheel.
3. Remove Old Sensor: Deflate the tire and use a TPMS tool to disconnect the sensor from the valve stem.
4. Install New Sensor: Attach the new TPMS sensor to the valve stem and ensure it is seated properly.
5. Reinstall Wheel: Place the wheel back on and hand-tighten the lug nuts before lowering the vehicle.
6. Torque Lug Nuts: Use a torque wrench to tighten the lug nuts to the manufacturer's specified torque value.