my BMW 5 Series F10/F11 (2010-2017) has a P0302 code, what should I do?

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover

   • Use a socket set to remove bolts securing the engine cover.
   • Carefully lift the cover off.

2. Replace Spark Plug (if needed)

   • Use a spark plug socket to remove the spark plug from cylinder 2.
   • Inspect the spark plug for wear; replace if necessary with OEM or equivalent spark plug.
   • Torque the new spark plug to the manufacturer's specification (typically around 15-20 Nm).

3. Inspect/Replace Ignition Coil

   • Disconnect the electrical connector from the ignition coil.
   • Remove the ignition coil using a socket or wrench.
   • Install a new ignition coil if the old one shows signs of damage or wear.
   • Reconnect the electrical connector securely.

3. Check and Replace Fuel Injector

1. Access Fuel Injector

   • If necessary, remove any components blocking access to the fuel injector for cylinder 2.

2. Remove Fuel Injector

   • Disconnect the electrical connector from the fuel injector.
   • Use a specialized tool or pliers to carefully pull the injector out of the intake manifold.

3. Install New Fuel Injector

   • Lubricate the O-ring of the new injector with clean engine oil.
   • Insert the new injector into the manifold and reconnect the electrical connector.

4. Perform Compression Test

1. Remove Spark Plug

   • Revisit the spark plug from cylinder 2 and remove it.

2. Attach Compression Gauge

   • Install a compression gauge into the spark plug hole.
   • Crank the engine for a few seconds and record the reading.

3. Evaluate Results

   • Compare the reading with manufacturer specifications. If low, further engine diagnostics may be required.