what does a P0302 code mean for my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil on cylinder 2:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the bolts securing the ignition coil and gently pull it out.
• Remove the spark plug:
  1. Use a spark plug socket to carefully unscrew the spark plug from cylinder 2.
  2. Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug:
  1. Torque the new spark plug to manufacturer's specifications (usually around 20 Nm).
  2. Reinstall the ignition coil and secure it with bolts.
  3. Reconnect the electrical connector.

3. Check and Replace Ignition Coil (if needed)

• Tools Required: Socket set, multimeter.
• Test ignition coil:
  1. Use a multimeter to measure resistance across the ignition coil terminals.
  2. Compare readings to manufacturer specifications; replace if readings are out of range.
• Install new ignition coil:
  1. Position the new ignition coil over the spark plug and press down until it clicks into place.
  2. Secure it with bolts and reconnect the electrical connector.

4. Inspect Fuel Injector (if needed)

• Tools Required: Fuel pressure gauge, socket set.
• Check fuel injector operation:
  1. Use a fuel pressure gauge to measure the fuel pressure at the fuel rail.
  2. If pressure is low, inspect the fuel filter and pump.
• Replace the fuel injector if clogged:
  1. Disconnect the electrical connector and fuel lines from the injector.
  2. Remove the old injector and install the new one, ensuring proper seating.