what does it mean if my BMW X3 G01 (2018-2024) has a P0303 code

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Remove the engine cover using a socket set.
• Locate the spark plug for cylinder 3 (refer to the vehicle manual if necessary).
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, electrode wear).
• If necessary, replace the spark plug with a new one (ensure it matches OEM specifications).
• Torque the new spark plug to the manufacturer’s specifications (typically around 20 Nm).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 3.
• Remove the ignition coil using a socket.
• Inspect the ignition coil for any visible damage or signs of failure.
• Replace with a new ignition coil if defective and torque it according to specifications (usually around 10 Nm).

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 3.
• Use a multimeter to check for proper resistance (consult specifications for your injector).
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector after replacement.

5. Reassemble and Check for Leaks

• Reinstall the engine cover and reconnect the battery.
• Start the engine and monitor for any leaks in the fuel system.
• Make sure the check engine light is off after the repairs.