my BMW X5 G05 (2019-2024) has a check engine light and rough running

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Ensure the vehicle is parked on a flat surface and that the engine is cool.

2. Address Check Engine Light

• Sub-step 1: Use the OBD-II scanner to retrieve and note error codes.
• Sub-step 2: Research the error codes to identify the specific issue (e.g., P0300 for random misfire).
• Sub-step 3: Clear the codes and see if they return after a test drive.

3. Inspect and Replace Components

• Sub-step 1: If misfire codes are indicated, remove the ignition coils by unscrewing them and disconnecting the electrical connectors.
• Sub-step 2: Replace any faulty spark plugs and ignition coils with OEM parts, ensuring correct torque specifications (typically 15 Nm for ignition coils).
• Sub-step 3: If the air filter is dirty, remove the air filter housing and replace the filter.
• Sub-step 4: Inspect and replace any damaged vacuum hoses.

4. Fuel System Check

• Sub-step 1: Inspect fuel injectors for leaks or clogs. Clean or replace them if necessary.
• Sub-step 2: Check the fuel pump operation by listening for it when the ignition is turned to the "ON" position (a faint humming sound should be heard).
• Sub-step 3: If the fuel pump is faulty, replace it following manufacturer guidelines.

5. Final Assembly and Testing

• Reconnect the battery terminal.
• Start the engine and check for abnormalities.
• Test drive the vehicle to ensure the rough running condition is resolved.