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

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

543 words

Problem Statement

The Tire Pressure Monitoring System (TPMS) in a BMW 3 Series G20/G21 (2019-2024) is malfunctioning, resulting in inaccurate tire pressure readings or warning lights being illumina

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear safety goggles and gloves when handling tires and working on vehicles.
•Ensure the vehicle is securely supported when lifting to avoid injury.

Symptoms

•TPMS warning light illuminated on the dashboard
•Inaccurate tire pressure readings displayed
•Vehicle displays "Tire Pressure Monitor Malfunction" message
•Sudden drop in tire pressure detected by the system
•Difficulty resetting the TPMS after tire changes or rotations

Diagnostic Steps

1
Scan the vehicle’s computer using an OBD-II scanner to check for any error codes related to the TPMS.
2
Inspect each tire for physical damage, punctures, or signs of air loss.
3
Check the tire pressures using a manual tire pressure gauge to confirm readings against the TPMS.
4
Inspect the TPMS sensors for corrosion, damage, or battery failure.
5
Verify that the TPMS system is properly calibrated and that the vehicle's settings for tire sizes are correct.
6
Attempt to reset the TPMS using the vehicle's onboard reset procedure.

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
•Manual tire pressure gauge
•Tire removal tools

Parts Required

•TPMS sensors (if replacement is necessary)
•Valve stems (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle’s computer using an OBD-II scanner to check for any error codes related to the TPMS.
2
Inspect each tire for physical damage, punctures, or signs of air loss.
3
Check the tire pressures using a manual tire pressure gauge to confirm readings against the TPMS.
4
Inspect the TPMS sensors for corrosion, damage, or battery failure.
5
Verify that the TPMS system is properly calibrated and that the vehicle's settings for tire sizes are correct.
6
Attempt to reset the TPMS using the vehicle's onboard reset procedure.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Tools Required: OBD-II scanner, manual tire pressure gauge, tire repair tools.

2. Inspect and Replace TPMS Sensors

Sub-step 1: Remove the tire from the wheel using a tire removal tool.
Sub-step 2: Inspect the TPMS sensor mounted within the tire for signs of damage or battery depletion.
Sub-step 3: If necessary, replace the TPMS sensor with a new one, ensuring it is compatible with the G20/G21 model.
Sub-step 4: Reinstall the tire onto the wheel, ensuring proper bead seating.
Sub-step 5: Inflate the tire to the manufacturer’s recommended pressure.

3. Reset TPMS

Sub-step 1: Turn the ignition to the "ON" position without starting the engine.
Sub-step 2: Navigate to the vehicle settings on the dashboard screen.
Sub-step 3: Select "Tire Pressure Monitor" and choose "Reset."
Sub-step 4: Confirm the reset process and monitor the system for any error codes.

4. Calibration

Sub-step 1: Drive the vehicle for approximately 10-15 minutes at speeds above 30 mph to allow the system to recalibrate.
Sub-step 2: Monitor the TPMS warning light for re-illumination or any error messages.