how to fix Tesla Model 3 Highland (2024-present) P0301 misfire code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to avoid electrical shock.

2. Remove Ignition Coil and Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Use a spark plug socket to remove the spark plug from cylinder 1.

3. Inspect and Replace Components

• Tools Required: Visual inspection tools, spark plug gap tool.
• Inspect the spark plug for wear; replace if damaged or fouled.
• Check the ignition coil for cracks or damage; replace if necessary.
• If the fuel injector is suspected, remove and clean it or replace it if malfunctioning.

4. Perform Compression Test

• Tools Required: Compression tester.
• Install the compression tester in place of the spark plug for cylinder 1.
• Crank the engine to take a reading; compare the result to the manufacturer's specifications.
• If compression is low, further diagnosis of internal engine components may be required.

5. Reassemble and Reconnect

• Reinstall the spark plug and ignition coil, ensuring proper torque (typically around 12-15 ft-lbs for spark plugs).
• Reconnect the ignition coil electrical connector.
• Reconnect the battery terminal.