why does my Porsche Cayenne E3 (2018-Present) keep throwing the P0302 code

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 tools and materials.
• Ensure the engine is cool, and disconnect the negative battery terminal.

Tools Required:

• OBD-II scanner
• Socket set
• Compression tester
• Noid light
• Smoke machine (optional)

2. Inspect and Replace Ignition Components

Sub-steps:

1. Remove the engine cover if equipped.
2. Disconnect the ignition coil harness from the ignition coil for cylinder two.
3. Remove the ignition coil using a ratchet and socket.
4. Inspect the spark plug in cylinder two; if worn or fouled, remove and replace it with the manufacturer-recommended spark plug.
5. Install the new spark plug and torque to manufacturer specifications (typically around 20 Nm).
6. Reinstall the ignition coil and reconnect the harness.

3. Check and Replace Fuel Injector

Sub-steps:

1. Disconnect the fuel injector harness for cylinder two.
2. Remove the fuel injector using an injector puller or a socket if applicable.
3. Inspect the fuel injector for clogs or electrical issues. If faulty, replace with a new injector.
4. Apply a small amount of engine oil to the O-ring of the new injector and install it into the rail, ensuring it seats properly.
5. Reconnect the fuel injector harness.

4. Verify Compression

Sub-steps:

1. Remove the spark plug for cylinder two again.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and record the reading. A healthy cylinder should have a reading within the manufacturer’s specified range (usually around 140-200 psi).
4. If low, further investigation into the engine internals may be required, such as valve issues or piston problems.

5. Final Checks

• Reconnect the battery terminal.
• Start the engine and let it idle, ensuring there are no further misfires.