how to fix my Tesla Model 3 Original (2017-2023) that has a P0302 code?

Solution

1. Preparation

• Gather tools: OBD-II scanner, spark plug socket, torque wrench, multimeter, compression tester, and basic hand tools.
• Ensure the vehicle is parked on a level surface, and the engine is cool.

2. Inspect and Replace Spark Plug

1. Disconnect the negative battery terminal to prevent electrical shorts.
2. Remove the engine cover if necessary to access the spark plugs.
3. Use a spark plug socket to remove the spark plug from cylinder 2.
4. Inspect the spark plug for signs of wear or damage; replace it if necessary with a new spark plug that meets manufacturer specifications.
5. Torque the new spark plug to the manufacturer's specified value (usually around 15-20 lb-ft).

3. Check and Replace Ignition Coil

1. Identify the ignition coil for cylinder 2.
2. Disconnect the electrical connector from the ignition coil.
3. Remove the ignition coil using the appropriate socket.
4. Inspect the ignition coil for cracks or signs of damage; replace if required.
5. Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

1. Locate the fuel injector for cylinder 2.
2. Disconnect the fuel injector connector and fuel line (ensure to relieve fuel pressure first).
3. Remove the fuel injector from the intake manifold.
4. Inspect the injector for clogs or deposits; clean or replace it as necessary.
5. Reinstall the fuel injector, ensuring proper sealing and connections.

5. Perform Compression Test (if necessary)

1. Remove the spark plug for cylinder 2 again.
2. Insert the compression tester into the spark plug hole for cylinder 2.
3. Crank the engine to get a compression reading; compare it with the manufacturer’s specifications.
4. If compression is low, further investigation of internal engine components may be necessary.