how to troubleshoot my Tesla Model 3 Original (2017-2023) with code P0301

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, and a fuel injector tester.
• Ensure the vehicle is parked on a level surface and set the parking brake.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1 (refer to the vehicle's service manual for the exact location).
• Using the socket set, carefully remove the spark plug.
• Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, excessive wear).
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.030 inches).
• Reinstall the spark plug and torque it to the specified value (usually around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder 1 by disconnecting the electrical connector and unscrewing the mounting bolts.
• Inspect the ignition coil for cracks or corrosion; replace if necessary.
• Install the new ignition coil, ensuring it is securely connected and torqued according to specifications.

4. Test Fuel Injector

• Use the fuel injector tester to check the operation of the fuel injector for cylinder 1.
• If the injector is not functioning correctly, replace it with a new one.
• Reconnect all electrical connectors and ensure they are secure.

5. Conduct Compression Test

• Use the compression tester on cylinder 1 following the manufacturer’s instructions.
• Compare the readings to the specifications found in the service manual.
• If the compression is low, further investigation may be needed for internal engine issues (valve problems, head gasket failure).

6. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery after all repairs are completed.
• Use the OBD-II scanner to clear the P0301 code from the vehicle's computer.
• Test drive the vehicle to ensure the issue is resolved.