how to diagnose a misfire code P0302 in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, noid light.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Replace Spark Plug

1. Remove Engine Cover: If applicable, remove the engine cover by unscrewing any bolts or clips.
2. Access Spark Plug: Locate the spark plug for cylinder 2, which may require removing intake components.
3. Remove Old Spark Plug: Use a spark plug socket to carefully unscrew and remove the old spark plug. Inspect for wear or carbon buildup.
4. Install New Spark Plug: Apply anti-seize compound on the threads (if applicable), and torque the new spark plug to the manufacturer’s specification (usually around 15 ft-lbs).

3. Replace Ignition Coil

1. Disconnect Ignition Coil Connector: Unplug the electrical connector from the ignition coil for cylinder 2.
2. Remove Ignition Coil: Unscrew the ignition coil from its mounting location and lift it out.
3. Install New Ignition Coil: Place the new ignition coil into position and secure it with screws. Reconnect the electrical connector.

4. Replace Fuel Injector (if necessary)

1. Remove Fuel Rail: Disconnect the fuel line and any connectors from the fuel rail. Unscrew the fuel rail bolts and gently lift the rail.
2. Remove Old Fuel Injector: Carefully pull the old fuel injector from the fuel rail, ensuring not to damage the o-rings.
3. Install New Fuel Injector: Lubricate the new fuel injector o-rings with engine oil and insert it into the fuel rail. Reattach the fuel rail, ensuring a proper seal.

5. Reassemble and Reconnect

• Reinstall any engine covers or components that were removed, ensuring all connections are secure.
• Reconnect the negative battery terminal.