how to fix P0302 code in BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is on a level surface and securely parked.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil by unscrewing the bolts and pulling it out gently.
• Unscrew the spark plug using the spark plug socket and inspect for wear (such as carbon buildup or damage).
• If the spark plug is faulty, install a new spark plug with the correct gap (typically 0.030-0.035 inches).
• Apply dielectric grease to the spark plug boot before reattaching the ignition coil.

3. Check and Replace Ignition Coil

• If the issue persists, remove the ignition coil from cylinder 2 and swap it with a known good coil from another cylinder.
• Re-scan for error codes. If the misfire code moves to the other cylinder, replace the faulty ignition coil.
• Install the new ignition coil, ensuring it is properly seated and secured.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner or replacement injector.
• If the fuel injector is suspected to be clogged, use a fuel injector cleaner through the fuel rail or replace the injector if necessary.
• To replace, disconnect the fuel line, unscrew the injector, and install the new one ensuring it is properly seated.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and attach the compression tester.
• Crank the engine a few times to get a reading. If the compression is low, further engine diagnostics may be required.