how to diagnose a bad catalytic converter in BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to ensure safety while working on electrical components.

2. Remove the Catalytic Converter

• Tools Required: Socket set, wrenches, penetrating oil, exhaust hanger removal tool.
• Apply penetrating oil to the bolts securing the catalytic converter to loosen them.
• Using the socket set, remove the bolts connecting the catalytic converter to the exhaust manifold and the exhaust pipe.
• Use the exhaust hanger removal tool to detach any hangers holding the converter in place.
• Carefully remove the catalytic converter from the vehicle.

3. Inspect and Replace

• Inspect the catalytic converter for signs of damage, clogging, or contamination.
• If defective, replace it with a new catalytic converter that meets OEM specifications.
• Ensure all gaskets and seals are in good condition and replace them if necessary.

4. Reinstall the Catalytic Converter

• Position the new or inspected catalytic converter in place.
• Reattach the exhaust hangers and connect the catalytic converter to the exhaust manifold and exhaust pipe, using new gaskets if applicable.
• Torque the bolts to the manufacturer's specifications (consult service manual for exact torque values).

5. Reconnect Battery and Test

• Reconnect the battery.
• Start the vehicle and allow it to reach operating temperature to ensure proper function.
• Check for any exhaust leaks and ensure the check engine light is off.