how to resolve P0302 misfire code in Porsche Cayenne E3 (2018-Present)

Learn how to diagnose and fix P0302 cylinder 2 misfire in Porsche Cayenne E3. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and components.
• Ensure the vehicle is on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary with OEM specifications (typically NGK or Bosch).
• Torque the new spark plug to manufacturer specifications (usually around 25 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition or the misfire persists, check the ignition coil.
• Tools Required: Socket set, multimeter
• Remove the ignition coil from cylinder 2.
• Test the ignition coil's primary and secondary resistance with a multimeter; replace if out of specification.
• Install a new ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• If the problem remains, inspect the fuel injector for cylinder 2.
• Tools Required: Fuel injector cleaning kit (if needed), diagnostic fuel pressure gauge
• Disconnect the fuel injector connector and remove it from the rail.
• Check for clogs or leaks; clean or replace the injector if necessary.
• Reinstall the injector, ensuring a proper seal, and reconnect the electrical connector.

5. Perform Compression Test

• If misfire persists after replacing components, perform a compression test on cylinder 2.
• Tools Required: Compression tester
• Remove the spark plug and install the compression tester.
• Crank the engine to measure compression; compare with manufacturer specifications (typically 180-210 psi).
• If compression is low, further diagnostics may be needed for internal engine issues.