how to address P0302 code on BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Remove engine cover if applicable.
• Use a socket set to remove the spark plug from cylinder 2.
• Inspect the old spark plug for signs of wear, fouling, or damage.
• Install a new spark plug, ensuring it's gapped to manufacturer specifications (typically around 0.030 inches for BMW).
• Torque the spark plug to the specified value (usually around 18 ft-lbs).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil at cylinder 2.
• Remove the ignition coil using the appropriate socket.
• Install the new ignition coil into cylinder 2 and secure it in place.
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel injector connector.
• Remove the fuel injector using a fuel injector puller if necessary.
• Inspect the injector for clogs or damage. Clean with an appropriate fuel injector cleaner if required.
• Reinstall the injector and reconnect the electrical connector.

5. Compression Test (if needed)

• Remove spark plugs from all cylinders for accurate testing.
• Insert the compression gauge into the spark plug hole of cylinder 2.
• Crank the engine and note the compression reading. It should meet manufacturer specifications (typically around 140-220 psi).
• If compression is low, further inspection may be required (valve seals, head gasket).

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Spark plug socket
• Fuel injector puller
• Compression gauge

Parts Required:

• Spark plug
• Ignition coil
• Fuel injector (if damaged)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect battery before working on electrical components.
• Allow the engine to cool before working on it to prevent burns.